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@gbj_tester
7075 is about 60% stronger than 6082. If you are a weight weenie with the FEA tools to exploit this, you could probably knock some weight off if your design analysis shows that strength is the limiting factor rather than stiffness. If you're going to be using a lot of material to keep the stiffness within acceptable bounds, you don't need the strongest alloy. Since most of us hobbyists tend more towards Brunel than NASA when doing engineering calculations, you could probably get away with puny pure aluminium, and 6082 has better corrosion resistance than 7075.