Perry,
Great work on the turret solution.
Looks like you still have room in the turret to add main gun elevation. Try the HL PZ III elevation unit and 2 heavy springs to hold the barrel at full up. The motor then depresses the barrel easily, once you adjust spring tension. Use your atomic cannon as a fulcrum, just like the PZ III solution.
I did read the last of Porsche Turret KT lacked zimmerit, probably in the Tamiya Directions.
But since you like zimmerit check out this KT:
http://www.naritafamily.com/Scalemod...hoto_frame.htm
You may want to finish this build with a better idler spring tensioner system. The kit's stock idler springs do not work. The plastic tracks will break as they flop around (right side mostly) and or throw metal tracks. Another solution is to anchor the idlers in place.
John