i got the idea for a mk3j in a recovery area from the photo below that I found in the Concord Publication, The Panzerkampfwagen 3 at War.
This shot has the tank with a long barrel but I wanted to model the earlier version with the 5cm L/42.

I also wanted the earlier style engine deck .
The two kits used were a Tamiya Mk3L and a Dragon Mk3 Stug f. I 'borrowed' the rear deck from the stug kit which I thebn ahd to marry onto the Tamiya one. This fit then required a reshaping with modeling clay and putty on the rear end to backdate to match the engine deck.
I then added aber brass and took the guards off as in the photo. I also drilled out the brake cooling air intake vent as I removed the cover as in the photo.

I also used Kasten final drive housings [brown in photo]top plate is only sitting on chassis.
I then added some scratch stuff like the scalloping under the guards and interior stuff that wasn't Aber but needed to be there to fill in when you looked through the open hatch.

more to come.......