Print frames of various sizes, in fine woods could be a good item for him/her to have an ongoing product to list on the website... The difficulty would be the time to design and make the jigs & fixtures to do multiples. Using high quality glass and visually appealing woods with spring brass clips, one could receive a good return. Nice tools are a joy for craftspeople to use... The problem with film holders is the light tightness they require and the aging of the woods for the required stability they need..... Frames don't need the same accuracy & detail. I'm a classical guitar and lute/oud maker and have tossed around this idea as a use for high quality cut offs/scraps from instrument making. If you decide on film holders, I have aged wood both figured and 1/4 sawn to sell that is extra, in my loft... Be Well, Bill