The Czech company
Plusmodel just released a WWII Russian Stalinec bulldozer: resin, metal parts, vacuform top. Really something different for a stunning dio. Not cheap, though. I didn't order anything, so I don't speak from experience. But they seem to have nice stuff. I just happened upon one of their kits for the first time in a hobby shop earlier this week. It really looked top class. They only seem to sell through the internet to wholesalers, but there's a list of distributors for most countries.
They seem to have more where that came from to support WWII Balkan dioramas.... Just look at this one... !