diff --git a/lump/displightmapsampleposition.go b/lump/displightmapsampleposition.go
index 2e94fd1..803aac9 100644
--- a/lump/displightmapsampleposition.go
+++ b/lump/displightmapsampleposition.go
@@ -2,4 +2,4 @@ package lump
 
 // DispLightmapSamplePosition is Lump 34: DispLightmapSamplePosition
 // NOTE: This does NOT have a mapped format yet, and is readable as []byte only
-type DispLightmapSamplePosition = RawBytes
+type DispLightmapSamplePosition = rawBytes
diff --git a/lump/lump.go b/lump/lump.go
index 64c1a9d..7cfd06a 100644
--- a/lump/lump.go
+++ b/lump/lump.go
@@ -9,31 +9,11 @@ import (
 	"unsafe"
 )
 
-// unmarshallBasicLump is a helper function for unmarshalling []byte to lumps that are just a single []T.
-func unmarshallBasicLump[V any](raw []byte) ([]V, error) {
-	if len(raw) == 0 {
-		return nil, nil
-	}
-
-	var sampleV V
-	v := make([]V, len(raw)/int(unsafe.Sizeof(sampleV)))
-	if err := binary.Read(bytes.NewBuffer(raw), binary.LittleEndian, &v); err != nil {
-		return nil, err
-	}
-
-	return v, nil
-}
-
-// marshallBasicLump is a helper function for marshalling lumps that are just a single []T to []byte.
-func marshallBasicLump(data any) ([]byte, error) {
-	var buf bytes.Buffer
-	err := binary.Write(&buf, binary.LittleEndian, data)
-	return buf.Bytes(), err
-}
+// Unimplemented is Lump n: Unimplemented lump type.
+type Unimplemented = rawBytes
 
 // Metadata is a Helper info for a lump
 type Metadata struct {
-	length  int
 	version int32
 }
 
@@ -47,60 +27,81 @@ func (info *Metadata) SetVersion(version int32) {
 	info.version = version
 }
 
-// RawBytes is Lump n: RawBytes lump type
+// rawBytes is Lump n: rawBytes lump type
 // the contents are just raw bytes, left up to the implementer to handle.
-type RawBytes struct {
+type rawBytes struct {
 	Metadata
 	Data []byte `json:"data"`
 }
 
 // FromBytes imports this lump from raw byte Data
-func (lump *RawBytes) FromBytes(raw []byte) error {
+func (lump *rawBytes) FromBytes(raw []byte) error {
 	lump.Data = raw
 
 	return nil
 }
 
 // Contents returns internal format structure Data
-func (lump *RawBytes) Contents() []byte {
+func (lump *rawBytes) Contents() []byte {
 	return lump.Data
 }
 
 // ToBytes converts this lump back to raw byte Data
-func (lump *RawBytes) ToBytes() ([]byte, error) {
+func (lump *rawBytes) ToBytes() ([]byte, error) {
 	return lump.Data, nil
 }
 
-type Unimplemented = RawBytes
+// unmarshallBasicLump is a helper function for unmarshalling []byte to lumps that are just a single []T.
+func unmarshallBasicLump[V any](raw []byte) ([]V, error) {
+	if len(raw) == 0 {
+		return nil, nil
+	}
+
+	var sampleV V
+	v := make([]V, len(raw)/int(unsafe.Sizeof(sampleV)))
+	if err := binary.Read(bytes.NewBuffer(raw), binary.LittleEndian, &v); err != nil {
+		return nil, err
+	}
+
+	return v, nil
+}
+
+// marshallBasicLump is a helper function for marshalling lumps that are just a single []T to []byte.
+func marshallBasicLump(data any) ([]byte, error) {
+	var buf bytes.Buffer
+	err := binary.Write(&buf, binary.LittleEndian, data)
+	return buf.Bytes(), err
+}
 
 // unmarshallTaggedLump is a helper function for unmarshalling []byte to lumps that are just a single []T.
 // It uses the "bsp" tag on struct fields to determine which fields to read.
-func unmarshallTaggedLump[V any](raw []byte, version string) ([]V, error) {
+// It is generally useful for lumps that have multiple versions and have different fields & lengths of T.
+func unmarshallTaggedLump[T any](raw []byte, version string) ([]T, error) {
 	if len(raw) == 0 {
 		return nil, nil
 	}
 
-	var sampleV V
+	var sampleT T
 
 	// Figure out the length of our struct for our version.
-	var binarylenV int
-	for _, field := range reflect.VisibleFields(reflect.TypeOf(sampleV)) {
+	var binarylenT int
+	for _, field := range reflect.VisibleFields(reflect.TypeOf(sampleT)) {
 		// Fields that are in this version should contribute to the length.
 		if t := field.Tag.Get("bsp"); t == "" || t == version {
-			binarylenV += int(field.Type.Size())
+			binarylenT += int(field.Type.Size())
 		}
 	}
-	if len(raw)%binarylenV != 0 {
+	if len(raw)%binarylenT != 0 {
 		// length doesn't match exactly a multiple of our calculated struct size.
-		return nil, fmt.Errorf("lump length %d is not a multiple of %d", len(raw), binarylenV)
+		return nil, fmt.Errorf("lump length %d is not a multiple of %d", len(raw), binarylenT)
 	}
 
 	// Calculate the padding size to properly read the struct.
-	padSize := int(unsafe.Sizeof(sampleV)) - binarylenV
+	padSize := int(unsafe.Sizeof(sampleT)) - binarylenT
 
-	v := make([]V, len(raw)/binarylenV)
+	v := make([]T, len(raw)/binarylenT)
 	for i := range v {
-		b2 := append([]byte{}, raw[(binarylenV*i):(binarylenV*i)+binarylenV]...)
+		b2 := append([]byte{}, raw[(binarylenT*i):(binarylenT*i)+binarylenT]...)
 		buf := bytes.NewBuffer(append(b2, []byte(strings.Repeat("\x00", padSize))...))
 		if err := binary.Read(buf, binary.LittleEndian, &v[i]); err != nil {
 			return nil, err
@@ -112,7 +113,8 @@ func unmarshallTaggedLump[V any](raw []byte, version string) ([]V, error) {
 
 // marshallTaggedLump is a helper function for marshalling lumps that are just a single []T to []byte.
 // It uses the "bsp" tag on struct fields to determine which fields to write.
-func marshallTaggedLump[V any](data []V, version string) ([]byte, error) {
+// It is generally useful for lumps that have multiple versions and have different fields & lengths of V.
+func marshallTaggedLump[T any](data []T, version string) ([]byte, error) {
 	if len(data) == 0 {
 		return []byte{}, nil
 	}
diff --git a/lump/lump_test.go b/lump/lump_test.go
index 96d6b4d..33afb7f 100644
--- a/lump/lump_test.go
+++ b/lump/lump_test.go
@@ -5,7 +5,7 @@ import (
 )
 
 func TestUnimplemented_GetData(t *testing.T) {
-	sut := RawBytes{}
+	sut := Unimplemented{}
 	data := []byte{0, 1, 2, 5, 43, 156, 146, 3, 3, 6}
 	if err := sut.FromBytes(data); err != nil {
 		t.Error(err)
@@ -18,7 +18,7 @@ func TestUnimplemented_GetData(t *testing.T) {
 }
 
 func TestUnimplemented_Marshall(t *testing.T) {
-	sut := RawBytes{}
+	sut := Unimplemented{}
 	data := []byte{0, 1, 2, 5, 43, 156, 146, 3, 3, 6}
 	if err := sut.FromBytes(data); err != nil {
 		t.Error(err)
@@ -40,7 +40,7 @@ func TestUnimplemented_Marshall(t *testing.T) {
 }
 
 func TestUnimplemented_FromBytes(t *testing.T) {
-	sut := RawBytes{}
+	sut := Unimplemented{}
 	data := []byte{0, 1, 2, 5, 43, 156, 146, 3, 3, 6}
 	if err := sut.FromBytes(data); err != nil {
 		t.Error(err)
diff --git a/lump/pakfile.go b/lump/pakfile.go
index f169012..3266b9e 100644
--- a/lump/pakfile.go
+++ b/lump/pakfile.go
@@ -9,7 +9,7 @@ import (
 
 // Pakfile is Lump 40: Pakfile
 type Pakfile struct {
-	RawBytes
+	rawBytes
 	zipReader *zip.Reader
 }
 
diff --git a/lump/physdisp.go b/lump/physdisp.go
index 434746e..da824e7 100644
--- a/lump/physdisp.go
+++ b/lump/physdisp.go
@@ -1,4 +1,4 @@
 package lump
 
 // PhysDisp is Lump 28: PhysDisp
-type PhysDisp = RawBytes
+type PhysDisp = rawBytes
diff --git a/version.go b/version.go
index c350c07..f955b89 100644
--- a/version.go
+++ b/version.go
@@ -24,7 +24,7 @@ func LumpResolverByBSPVersion(id LumpId, header Header) (l Lump, err error) {
 		// @TODO: Implement v21.
 		l, err = getV20Lump(id)
 	default:
-		l, err = &lump.RawBytes{}, nil
+		l, err = &lump.Unimplemented{}, nil
 	}
 
 	l.SetVersion(header.Version)
@@ -80,13 +80,13 @@ func getV20Lump(index LumpId) (Lump, error) {
 	case 21:
 		return &lump.AreaPortal{}, nil
 	case 22:
-		return &lump.RawBytes{}, nil //portals | unused0 | propcollision
+		return &lump.Unimplemented{}, nil //portals | unused0 | propcollision
 	case 23:
-		return &lump.RawBytes{}, nil //clusters | unused1 | prophulls
+		return &lump.Unimplemented{}, nil //clusters | unused1 | prophulls
 	case 24:
-		return &lump.RawBytes{}, nil //portalverts | unused2 | prophullverts
+		return &lump.Unimplemented{}, nil //portalverts | unused2 | prophullverts
 	case 25:
-		return &lump.RawBytes{}, nil //clusterportals | unused3 | proptris
+		return &lump.Unimplemented{}, nil //clusterportals | unused3 | proptris
 	case 26:
 		return &lump.DispInfo{}, nil
 	case 27:
@@ -94,7 +94,7 @@ func getV20Lump(index LumpId) (Lump, error) {
 	case 28:
 		return &lump.PhysDisp{}, nil
 	case 29:
-		return &lump.RawBytes{}, nil //physcollide.
+		return &lump.Unimplemented{}, nil //physcollide.
 	case 30:
 		return &lump.VertNormal{}, nil
 	case 31:
@@ -102,7 +102,7 @@ func getV20Lump(index LumpId) (Lump, error) {
 	case 32:
 		// @TODO: This appears to be stripped by VRAD.
 		// Find samples to test.
-		return &lump.RawBytes{}, nil //disp lightmap alphas
+		return &lump.Unimplemented{}, nil //disp lightmap alphas
 	case 33:
 		return &lump.DispVert{}, nil
 	case 34:
@@ -112,7 +112,7 @@ func getV20Lump(index LumpId) (Lump, error) {
 	case 36:
 		return &lump.LeafWaterData{}, nil
 	case 37:
-		return &lump.RawBytes{}, nil //primitives @TODO - Appears to be 4bytes unaccounted for at end of lump?
+		return &lump.Unimplemented{}, nil //primitives @TODO - Appears to be 4bytes unaccounted for at end of lump?
 	case 38:
 		return &lump.PrimVert{}, nil
 	case 39:
@@ -136,9 +136,9 @@ func getV20Lump(index LumpId) (Lump, error) {
 	case 48:
 		return &lump.DispTris{}, nil
 	case 49:
-		return &lump.RawBytes{}, nil //physcollidesurface | prop blob
+		return &lump.Unimplemented{}, nil //physcollidesurface | prop blob
 	case 50:
-		return &lump.RawBytes{}, nil //wateroverlays
+		return &lump.Unimplemented{}, nil //wateroverlays
 	case 51:
 		return &lump.LeafAmbientIndexHDR{}, nil
 	case 52:
@@ -152,7 +152,7 @@ func getV20Lump(index LumpId) (Lump, error) {
 	case 56:
 		return &lump.LeafAmbientLighting{}, nil //leaf ambient lighting
 	case 57:
-		return &lump.RawBytes{}, nil //xzippakfile
+		return &lump.Unimplemented{}, nil //xzippakfile
 	case 58:
 		return &lump.FaceHDR{}, nil
 	case 59:
@@ -160,11 +160,11 @@ func getV20Lump(index LumpId) (Lump, error) {
 	case 60:
 		return &lump.OverlayFade{}, nil
 	case 61:
-		return &lump.RawBytes{}, nil //overlay system levels
+		return &lump.Unimplemented{}, nil //overlay system levels
 	case 62:
-		return &lump.RawBytes{}, nil //physlevel
+		return &lump.Unimplemented{}, nil //physlevel
 	case 63:
-		return &lump.RawBytes{}, nil //disp multiblend
+		return &lump.Unimplemented{}, nil //disp multiblend
 	default:
 		return nil, fmt.Errorf("invalid lump id")
 	}
diff --git a/version_test.go b/version_test.go
index bd29251..dbcd261 100644
--- a/version_test.go
+++ b/version_test.go
@@ -18,7 +18,7 @@ func TestGetLumpForVersion(t *testing.T) {
 			name:    "unknown version",
 			id:      4,
 			version: 987,
-			t:       reflect.TypeOf(&lump.RawBytes{}),
+			t:       reflect.TypeOf(&lump.Unimplemented{}),
 		},
 		{
 			name:    "v19",