I'm helping a friend build a new second floor laundry room and have run cable for a 40A sub-panel for the washer, dryer, outlets and lights. This room is in an old attic space where the ceiling runs from 9' to 5' over the length of the room. In the short end of the room (ceiling from 4.5' to 2') they are building a storage space (insulated and rough drywalled) accessed by a 36Hx24W" door. Do you see any problems or restrictions with placing the panel just inside the small door? The center of the panel would be at 36" and there will be permanent lighting in this 60"x96" crawlspace.
I would put it in the new room, but all of the walls have washer, dryer, or cabinets on them...