Hello Razzie,
Well done so far! I like the engine (dirty and greasy as a real one), the paint/rust finish on the deck and even more like how the welding was done. One question: why did you dry-brush with white on the panel edges? It looks cool but what was the intention? I'm no expert in experimental (or paper) panzers. Was it a factory-process for some reason?
Plus an additional thing: the grilles has some paint blocks - you should treat them with a pin just to be perfect
cheers,
Zsolt