The closest imperial tubing size I could find was 1"x3" which wasn't going to work, so unfortunately it needs to be cut from 3/4" plate steel. I've occasionally seen references to 20x70 mm tubing which would work, if you can source it. I tried but failed to find a reasonable place to get it.
Note quite sure what you're after. The PDF attached to my original post already includes dimensions, but I went ahead and emailed you a copy. Please let me know if you were wanting something beyond this.
As detailed in the attached PDF, I need:
* 14 stainless "double-posts" (of 4 types)
* 32 stainless glass brackets (of 2 types)
* 28 aluminum railing brackets (of 3 types)
Stainless posts and glass brackets to have a brushed finish aligned to the major access.
Brushed finish should be high...