I will keep an eye on this mod, I've always wanted to see a mid-19th century mod for Warband.
As I do not know about texturing and modelling, I will help you in the simple ways that I can.
You asked for main menu music? Here you have main menu music! With explanation of why it would be a good choice and all.
But of course these are just my personal recommendations, I aslo liked the ones you posted before.
1st The Ride of the Valkyries:
Composed by Richard Wagner around 1870. Fits the period of the mod, known world around and quite bellicose.
2nd Europe + A song + 19th Century= The mighty 9th of Ludwig van Beethoven:
It was composed over 40 years ago to the period of the mod, but in my opinion it fits well. Doesn't need more description.
http://www.youtube.com/watch?v=Iq-3B6xfNpY
3rd Concierto of Aranjuez:
This one may be not known by everyone. It was composed by a musician of my country (Spain) in 1945, after the Spanish Civil War. Its more shoft and nostalgic than the other 2 above, and invites to reflect about the horror of war. In the 1860s as in the 1930s, Spain was plunged constantly in revolts, violence and murdering between people of the same nation... It may be more personal, but I also think it would be a nice choice for the main menu along a picture of a devastated battlefield.
Hope you like them!