Oops Vaughn ,
I forgot I have a coupla metal boards as you describe, but my brain went directly to old and wood when I saw Kodak. I have made a coupla dozen boards with all kinds of tools, holesaws, Forstner bits, table saw, X-acto, AND my son cut me a bunch of aluminum for 6x6 to 4x4 adapter boards on his giant hipressure water computer controlled cutter. I still have all my fingers and no new scars. Someday I may even finish a project that I made a 9x9 to 6x6 adapter for- or not.
Anybody wants a Sinar board it's free- All you gotta do is get the lens unscrewed from it [in no worse shape than now-no pipe wrenches] I made an adapter to 6x6 for that one.
Dang I should go make pictures
Regards
Ed