If it was me, I would have a tab and a bunch of flanges. Then I would add a 2 way corner and a 3way corder with treatment as desired. Then I would unbend, cut and rebend to create gaps for welding and springbacks.
Without the unbend-cut rebend. you cant dial in the welding gaps and space required for springbacks durring folding.
If this is stainless, typically 8 deg spring back needs to be accounted for.