So the chasis is right...now for the hard part. 
Great find , I was shocked at the age of the chasis because of the more modern look of the over all design.  The gun system on top, at a quick glance, looks like it could be at home on a stryker.  I'll pick up trying to figure the rest out tomorrow after my exam, but i'm sure someone else will nab it by then.  
Chasis
http://en.wikipedia.org/wiki/Panzer_38(t)