I have talked to reps from both Trachte and Betco about triangular units. Both say that their hallway systems have been configured this way in rare situations - typically when they have to avoid a support column in a conversion project. The use of a swing door in this case will avoid the problem of the roll-up door taking up a lot of space at the top of the unit. These areas may also be a good place to use stacked lockers - where cubic feet is not as important as getting some smaller units into the unit mix.