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Velocio
Brun
You could do it with 30x30 profile if weight is a consideration. There are plenty of fastening options and it's very easy to completely over engineer this stuff. When unpacking the 20x20 it seemed more slender than I imagined, but think it's spot on in this case.
It can certainly be added to very easily. You also have the option of replacing parts and rebuilding but that's obviously more expensive and time consuming.