That Bimmer looks really cool Nadeox! That model BMW is really the nicest one they ever made in my opinion. Really wish it had some more detail though, especially the sides and the a/b/-pillars really lack detail. The whole part where the roof curves into the door is just one polygone wide it seems, so it seems really flat, while in real life it's obviously a nice curve... The wheelarches should be a lot more defined as well. The real car has a flare around it which, in a low poly model, would be really easy to make by just extruding the wheelarch, scaling the edge of it, pulling it out a bit and adding a hard edge where the old edge was... Something like that would be pretty easy to do on the model and it would definately add a lot of realism to the car.
Modeled a bit on the tank today and yesterday. Suspension is pretty much finished as far as I can tell. I think the next thing I'll make is the fuelcap in the center and then the turret. That, or the wheels/cogs... Probably should make the wheels/tracks first to see how many polygons they're gonna be. Trying to keep this at very least under 40k polys, and I'm already at 12k with only one side of suspension :/