Nice job on the build and the review Andras, it looks a bit of a challenge with that number of small resin parts. You're right that it does look a bit old school, and looks as if it suffers a little from the same problem as that resin Centurion you passed to me with the tracks not being quite straight. Hard to do anything about it though.
Dragon's small Panthers all have that location mark on the back plate that looks like it is for the Bergepanther shovel, but if they ever get around to producing it, it probably won't have zimmerit...
On the bent chain run, perhaps just clamping it dead straight and then giving it some hairspray or some kind of glue, might that be enough to hold it straight?