I agree that that is probably something converted to look like a StuG.....road wheels, rear idler and tracks are wrong from the reference pics I can find. Suspension doesn't look right either.
Edit: On further review, I'd guess that possibly started life as a Chaffee chassis.
'09 Kawi Versys
"A life is like a garden. Perfect moments can be had, but not preserved, except in memory. LLAP" - Leonard Nimoy
MN_Smurf screwed with this post 05-22-2012 at 12:15 PM