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other possibilities
You could also use 2024-T4. We pretty much interchangeably use 2024, 6061, 7075 depending on whats readily available and what shapes are available.
The 7075 makes for a nice surface finish if you are going to go crazy polishing it.
If you are going to be bending thin sheets of it into different shapes, something more bendable like 3003 series is better - it won't crack as easily as the others.
If you are going to weld it, make sure you periodically check the highly-stressed areas of the structure because they will probably crack.
Ken
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