Thank you … gives a good idea. I would need to do the same for my open frame laser as well, I assume (obviously!)
I use a 16" x 16" steel pegboard. Fixed my laser to a base board, use the laser to cut a 16"x16" square, insert pegboard. Now I have precise positioning across my work area (or at least the 16"x16") portion as the pegboard holes are precisely 1" apart. Jigs are cut from wood with holes for magnets and 1/4 inch pegs or bolts. 99% of my cutting us just done off a fence that aligns with one edge. For bonus points use magnets to clamp materials down and/or suspend them, or use magnetic spikes to elevate material to be cut.
This is simple, very accurate, very repeatable, and very cheap for my open frame diode (Ikier k1)