It would be handy to have an option for, when you are putting in Windows when there is a Mezzanine and Lean-To on the shed, asking if you are wanting the window above or below the mezzanine floor.
As it stands at the moment, I can put a window above the mezzanine/lean-to roof, but not below. I can put a Roller Door or PA Door on the bottom level, but not Windows or Glass Sliding Doors