I have been a little sick so havent done much. The metal band suspnension is not going to work, way too loose stuff. I taped three of them together and one suspension arm bottomed out at around 1.3kg, thats only 16kg for all 12 arms. I could use something like a very large band saw blade, but then there could be space issues.. I think Im gonna use spring steel rods, I have no idea where to get them or what thickness I need but I'll figure that out later. This guy
http://youtu.be/Y5tfvQjeOFI has similiar sized and weighed tank and the suspension looks pretty good.
As for electronics.. Drive motors are gonna be
MY1016, 24V 350W from a scooter
Sabertooth 2x25 for speed controller
SportBec
DoubleSwitch relay for firing the cannon
+some small geared motors for turret and maybe a dozer blade.
I could use some recommendations for small <1A brushed ESCs and radios with atleast 6 channels. At the moment Im thinking about getting a Turnigy 9X, seems pretty good for the price since I dont need any fancy features.