The doors shown open all the way and provide full access to the 'underneath'. Since the frame construction is all 2x4's, there are few legs and the area is relatively wide open for easy wiring and maintenance. The aisle curtains hang from rods, which rods are supported by 3/4" x 3/4" X 1-1/2" blocks with holes to accept the rods.
The corner doors also open.
This used to be a maintenance-only aisle, as it is only 20" wide. But soon it became a viewing aisle as well, and gave me a lot more real estate for scenery.
Alex