Here are the scripts I used to train an HTK recognizer using 
the spanish data I found on Voxforge (approx. 20 hours). The 
data are not perfect but one can build a baseline recognizer using them. The
recipe is based on Keith Vertanen's scripts for HTK TIMIT + WSJ 
ASR training (http://www.keithv.com/software/htk).

Experimenting with Makefiles these days, I wrote the entire 
process as a Makefile and I have to say it can be quite convenient for this task.
However, there are many things that I haven't really fixed and haven't
yet fully harnessed the power of make :) This is yet to be done.

The idea is to just write (after updating the paths in the makefile):
make all

and wait. Of course you may need to delve deeper into the code if you have more 
specific needs. I haven't really tested it yet in an independent setup so it
may need minor modifications to work for a different dataset or on a 
different machine. I will be working on it and this code should only 
be considered as a working version and not an official release.

In case you just need the spanish acoustic models for HTK, please feel free
to contact me and I could share them with you. If you have spanish data
you would like to train an ASR on, we could work on that together. 

Nassos Katsamanis