If anyone's interested in checking out my Old Tamiya M4 and my M36B-1 build they're on RC Groups Tanks page. Here's a couple links:M4 Sherman
http://www.rcgroups.com/forums/showthread.php?t=2412393
M36B-1 upper hull for my Tamiya M4 chassis:
http://www.rcgroups.com/forums/showthread.php?t=2495679
I'm planning on building a couple upper hulls out of thin gauge sheet steel to make an M7 and an M-10. I just picked up two HL Sherman's that will be used for the M7 and M10 upper's I'll be building. Then I'll be able to use the M36B-1 upper hull on one of the HL chassis to make it look more realistic with the correct suspension.
In the end I'll have 3 tanks with many upper hulls that can be swapped out to have different tanks on the battle field.