It's been awhile since I've been on the forum, but I thought I'd take this opportunity to share my CIH screen build with fellow CIH-ers.
This design has dual motors, with up to 10 presets. The motors are garden-variety gear motors, with a torque rating of around 150 oz-in. The controller is a home-brew design. Screen material is white-washed canvas (painter's canvas) which actually works pretty well, with a gain of around 1.0. Enjoy!