If you see the form blocks I have been making, there are 2 sets for each part, the bending formers, and the cutting templates. Each set is made up of 2 pieces of wood with matching tooling holes that I can bolt through. I lay one piece of the cutting template over the sheet of aluminum and drill through the tooling holes through the aluminum. Then I put the other cutting template piece underneath the aluminum sandwiching it between the two and bolt them together. Then I run a hand held router with a 1/4" or 3/8" end bearing around it which cuts the aluminum exactly to the edge of my cutting templates. It makes a lot of metal shavings everywhere, but makes for a perfectly repeatable part with very smooth edges.