So it's been awhile, I've just been lazy posting new stuffs up but I've been doing some R&D at home (mostly rigging and workflow stuff).  I'm pretty sure you guys noticed already that I'm a bit of a military weapons nerd, and I'm not sure why I haven't done this already, but I've decided to model a tank.  I'm planning to fake a lot of detail using normal / displacement maps so I'm thinking of keeping the model somewhat medium weight.  Though my biggest challenge is figuring out a good way to rig those tank threads - I figure it needs to be a sort of "rubber band" style setup but I have no idea at this point.  Anyhoo, if anybody cares, this is a real tank, a Russian T54/55, some references here: 
http://en.wikipedia.org/wiki/T-54/55