Hello, sorry for bothering again, I just wanted to say that I have, somewhat, implemented the bc units in my ss6.1, combining the default ss6.1 battle_models file with the broken sword 6.4 one, and it seems to work ok, (I only added the units, I'm not confident enough to mess with the officers).
I have made quite a number of test in campaign battles and custom battles and all seems ok. Just wanted to say thanks Phosphoricus for your inspiration and of course thanks to the Stainless Steel and Broken Crescent modding teams.
cheers