I've tired to answer similar question. so, please, READ THIS FUCKING MANUAL!
First. I DON'T MAKE mods for XNA. I don't even HAVE IT. So if some model don't work in your prec-c-cious XNA You'll need to:
1) Use XPS. Later version is 10.9.5 - 4 Anniversary Edition (
[link])
2) ...
3) PROFIT
Dixi.