door mounting: - i was thinking of M12 threaded bar welded to the box section so i could fix the door in place with nuts but i can also see a disadvantage to this as well as advantage, on the plus side you would be able to make sure all the door was in contact with the seal and adjust pressure around the door for best fit. negative would be quite a few bolts to do up and undo when putting the door on or taking it off and due to extra bracing the door might be fairly heavy