Yep...it sure looks like a after market addition. The only problem we've had is with the jam. Sometimes it a little hard to open, but it seals great. Last trip, we went over 9,100' pass in the rain and snow and no leaks
OH...I forgot to note that it has a AC unit inside, below the closet. That is what the vent on the right of the door. All around wood cabinets as well. Very cute.