Just wanting to learn about them. Looks like a broad topic. Looking to build, or buy some.

You have to narrow it down to what the screen will be used for-what kind of projector you are going to use.Are your speakers going to be on the sides of the screen or behind it.Behind-you will need a perforated screen-as in movie theaters.Those can be EXPENSIVE-sometimes several dollars per square foot of screen.Perforated screens are also VERY FRAGILE-can be torn easily if mishandled.