[Aren_Hill]

I'd like to defend 1x1x.0625" tubing a bit.
What material you use for your base totally depends on what type of base it is.
Such as us (1625) wildstang (111), and the BEAST (71) who had swerve drives this past year. Our robot used 1x1x.0625" for the frame and i believe 111 and 71 did also, just because of what had to fit and how many supporting members are needed.

If we use a different drivetrain i'm pretty confident we'll use other materials.