okay, first, welcome. second, there's a couple things that needed to be addressed.
for the BC engine textures must be a fixed exponential factor in size...32, 64, 128, 256, 512, 1024, 2048 or they won't load.
it's not the POLY count you have to worry about, but the texture size. I've run ships as high poly as 54K and they've run well. since they're not moving parts models, they don't swipe memory. textures, however, make the engine choke if there's a lot of high res ones.
Nifskope is a good way to check the test fit and alignment of your textures.
oh, and if your wondering...I think I'm the only modeler and texturer LEFT on here that's a little bit active. everyone else has either moved on, or is rather busy atm raising kids.