My little local town has Al. supplier who will guillotine pieces to size for free If the order is over ?10.... I expect most towns will have similar.
I never bend pieces (although my Al. supplier can do that too for a small charge), I just cut angle-ally pieces and drill / tap M4 holes.
18 or 20swg for tank circuits, 3mm (10?swg) for chassis/front panels.
best 73
