Teflon isn't that hard to machine if your tooling is sharp. Machined a bunch of knife holders one time for a beef packing plant. If your cutters get dull though, watch out!

They make sheet material out of just about any "plastic" you want: PVC, CPVC, Nylon, PTFE, Polyethylene, Polystyrene, etc....goto US Plastics website and you can see a bunch of different kinds.

I just liked the looks of the recessed jacks and it looks like it would be much easier to drill the holes and mount than to thin down the case so you could mount the jacks to it.