An easier and cheaper way would be to get a gasket or seal shop to make you a cutting die. They use a piece of plywood that has strips of sharpened steel stuck into a router grove in the shape of your cuts. They are pretty damn cheap usually under $100, and work like hot damn. We have used them to cut sheets of rubber and its the only way to go for stuff like this.
An aluminum die with a plastic punch would probably leave a pretty sloppy, unprofessional looking cut.
__________________
Live free or die |