So, I am planning to make a film gate/mask and a set of spool spacers to convert a 616 (Agfa/Ansco Royal Readyset 1A) to a 120 pseudo-pano. I have calculated out that if I center the spools properly, I can get a 6cm X 10cm negative. Now, the question is, what should I make the film gate out of? I thought about just plain mat board, but I am a bit concerned about scratching the film? Is this a good idea or should I use a different material?