Hey yall I'm getting ready to get going one design of a DIY project of building a 4x10 folder similar to a old 1900s 6x9 folder. My biggest hold up is how I want to have the lense attach either by sliding lens into slots once open so I can close camera with lense inside, or have the lens board with lense on and foldable which would make the camera a bit beefier. My ideal lense would be a 240mm Fujinon A, 210 nikor W, or a 210 G-claron. What would yall suggest?