My box has no existing doors other than roll-up cargo door at the aft end. Using the existing door has been a convenience for you. However, I am not inclined to cut any access openings so I must come to another solution. These Fastar units are routinely mounted in home with a vent to the outside. And good venting to the outside due to CO is a real consideration. Anyway, I am inclined to mount to interior wall, duct to the outside, and then fabricate a metal box to cover the entire assembly, with special attention to sealing the unit from air exchange within the box. Note; I use the term box to refer to the inside of the living quarters. Thanks for sharing those photos.
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