Alright, lexan is in.
Next step: How to cut a perfectly round circle out of it.
I'm thinking of drilling a hole in the center and using a peg and bar attached to the jigsaw to go around. This will work for the inner one I think since I need to drill out the center anyway to fit between the hub/wheel.
For the outer one, I don't have any good ideas that keeps the disc completely smooth.
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