It all depends on the design of the cab. Mine is sturdy enough with the door open. It has a full height door, with 4 air vents with nice black painted grills and a lock. It is hinged on 4 kitchen hinges. These allow blind hinging, easy decoupling of the door when needed, they can carry 18mm of MDF at 700x1800mm and allow fine adjustments. But my cabs are standing free in space often, so the back had to be as nice as the front.