Theres a website here - best bet is to email them first though, so you can get an understanding of what they've got.
http://www.tankmuseum.org/schools-and-research/bovart52876
There are some good reports on the Panzer 3 & 4 turret and armament, and the Panzer 4 tank itself. I'd be surprised if there weren't equivalent reports on the Panzer 2, but you'll need to check on what they have.