nice shape-style! critic from an engineering student : it looks like teh mass centre is to far in the backpart so that the mecha might fall down . there shoukld be either a large conterweight on the head of the bot pe a big gun or you could put the legs less leaned backwards, more upright. or you could do the heel-pads larger and longer
You're right. Once I added more of the details to the limbs I ended up moving the torso forward on the pelvis. I also increased the size of the limbs by 15%, which seems to give a more pleasing sense of proportion to the entire thing. I'll probably end up increasing the size of the heel pads as well. It just doesn't feel quite massive enough yet.
I'm thinking of leaving it kind of nebulous, but I was thinking of early Cold War vehicles like the M48 and IS-3, and was intrigued at the way so may of them soldiered on for so long and would up with weird upgrades. Once I get this rigged I'll be putting it out as a stock model on Turbo Squid as a test to see whether or not it might be worthwhile to use them.
I would put a shock absorber piston and stabilizers between the lower leg and the rear toe, considering your ankle is a ball joint. Or, a heel stub like metal gear rex has. Just seems like a lot of weight for just ball joints to handle. Looks great otherwise!