Bill, I think I remember seeing pictures of that one before and it looks great. I really like how you hold the film holder to the back. Since I don't have access to power tools (just hand held ones that weigh too much for me to control), mine is constructed of foam core board and Ilford box tops. I'm expecting light leaks when I test it tomorrow. If my next door neighbor ever has some free time, maybe I'll see if he'd be willing to cut pieces for one like yours. Are you willing to give out the measurements and design?