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Re: pic: Prototype Drivetrain
Replace all the 1/16th wall aluminum with 0.035" wall 4130 steel square tubing. You'll improve chassis strength, stiffness, maintain the same weight, and your welder will have an easier time.
With a steel frame you could also use weld-in nuts which could save you weight and make it easier to wrench on the robot 
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Theory is a nice place, I'd like to go there one day, I hear everything works there.
Maturity is knowing you were an idiot, common sense is trying to not be an idiot, wisdom is knowing that you will still be an idiot.
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