Here's something I've been working with for a while. It started out with the turret, which was a plasticard excercise, and mimics the shape of a Russian KV-2. In the making, I attached it to an old Predator chassis which I first squared off with some heavy-duty plasticard. It was too big to look good as a mobile turret, so I bolted it down and voila, the "Schwerer Siegfried" was born.
Fluffwise, it is a converted agricultural tractor, a weapon of necessity converted in a field workshop at the order of a Tank Commissar who found himself, well, tankless. Ruleswise, it is an undersized Leman Russ Conqueror.
The model is still a work in progress, it's missing sponson heavy bolters and a pintle-mounted heavy bolter in the turret, as well as the tank commander himself.
Enough talk, onwards for the pictures. Check here: http://www.ageofstrife.com/gallery/Agamemnon203