Ideas for members wanting a Custom Canopy or Tray

[NissanGQ4.2]

Ay toddy how do yas stop the sheets from bowing during welding?
Guessing it's all mig welded?

Farked if I know @bigguwesty, I havn't used a welder since the year 2000 and it was with a stick and only on steel.

I can ask one of the welders if you like, I assume from what I have seen they just clamp if need be, tac then weld.