In traditional projection systems, the projector is mounted on the ceiling. Rear projection systems work from behind the screen. These video demonstrate building a wooden fixed-frame projector screen which will be permanently mounted to the wall.
This method is similar to a giant artist’s canvas, a wooden frame with the screen material stretched over it, and with a black contrast-boosting border placed around the edges for a professional look.
This allows you to create a custom setup to your preferences while saving a load of money in the process.
You don’t need a lot of skill to make something that’s functional, but if you’re on the fence about why you’d even want a rack case.