A Variety of window and door types can be used in the buildings. Window sizes from 1x7, 2x7, 3x3, 3x4... windows that slide horizontal or vertical, may be insulated and with tinted glass, or just a cased opening for your own special window or storefront glass.  Metal building doors can be single or double width man doors with panic device, door closers to pull door closed, special knobs, lever locks, dead bolts, bronze or white color finish, and also overhead door sizes are custom from 8x8 to 20...