At least for the time being, I've made boards from the backing of an otherwise useless photo frame.
-- Just cut the right size rectangle with a Stanley knife and a metal ruler,
-- marked out the holes with an old compass from school geometry (1970's)
-- cut out the holes with a Dremel type tool
-- drilled the locator pin hole for the 90mm with a regular drill
-- shaved the edges to thickness with the Stanley knife
-- painted them using a black sample applicator from the local hardware store.
They seem to be working fine.
I downloaded a file from Thingaverse and printed a lens board for a Crown Graphic and it worked out very well. I was taking an adult ed class and only had to pay less than $1 for material.
You can't teach an old dog new tech's!
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