Hello, I want to try 4X5 camera and I want to make it by myself. I want to make it simple and extremely low-cost so I decided to use a wood box instead of bellow. (Make it like a Kodak brownie). I will also use semi-transparent paper insted of ground glass. I know that I need a lens with shutter, film backs too.However, I don't know much about them. Can anyone suggest some very low-cost film backs and lens for me?