I will be using blackout cloth as my screen material for my DIY screen. I'm building the screen in 1.85:1 format (48" x 85.5") and would like to have a masking system for 2.35:1 movies. I have read about magents and other things to create a masking system but none seem plausible when attached to a cloth screen. Does anyone have any ideas on how to mask when I am using a cloth screen that is scretched over a 48" x 85.5" frame made of 1x4's? Thanks.