nix on the Jig saw, it will have that panel flopping around on your bench like a fish out of water .[/QUOTE]
To avoid all that flopping find yourself a piece of that 2" thick hard foam insulation used in the building industry. 2' x 2' is a good size. You can just lay the piece of alum on the insulation and hold it lightly with your off jigsaw hand and easily cut to your scribe lines. The blade will be buried in the insulation and not even know its there. The material does not slide around either. Just make sure the blade doesn't protrude out the bottom of the foam, stack two pieces if required. This works great.