1/16" sounds pretty thin for an electronic enclosure that's going to get whacked by golf clubs. I'd say 1/8" would be twice as good, and 3/16" would be 3 times as good. Delrin should work okay; nylon is more difficult to machine and makes long stringy swarf. You can get the same kind of material cheaper as "Acetal" plastic; Delrin is just a trade name for one brand of acetal.
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