It looks like a wedge...Ti or aluminum body?
What is nutstrip?
Overall, you have a good design. If I had to recommend one thing it would be to get a lot of driving practice once you have your bot built, or before if you have access to a toy RC car with tank steering and a decent speed. What I've found while working on Battlewagon is that a robot of any size and a decent top speed is going to be somewhat twitchy. You'll need to get used to that.
DPThe reciever is in a weird shape, what's its lowest point heightwise? If it's any less than .4875" then I don't have to redesign the thing again.