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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.
It's so nice I'm wondering whether I should go a similar route to tidy up and help reduce the noise of my computing rack.
I've currently got it all on open wire shelving which was cheap, but the NAS is noisy so I like the thought of enclosing it in a unit that I could add some foam padding to. Obvs not stopping airflow, but absorbing the worst of the noise.
The only issues I've got when thinking of this are: