thompsons are a particularly interesting thing to model. there are a bunch of variants with very subtle differences, but it looks like youre generally going for the 1928 model with that foregrip and iron sight
http://lh6.ggpht.com/_6rLALgCBhQQ/S-...1_Promo_01.jpg
those little things are up to you to customize. what im concerned with is the grip. not the foregrip, the other grip. its really disproportional.
E: for reference the thing i posted is NOT mine. i just found that picture to illustrate my point about the handle