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I like Sam's suggestion, but I would make the pattern out of chipboard (easier to modify and tweak) and back up the aluminum with plastic like sheet nylon, UHMW polyethylene, or UHMW polypropylene. The plastic will fabricate very easily with woodworking tools. This will give you a very stable surface and a solid base for the gauges.
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No one lives forever, the trick is creating something that will.
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