If possible a calendar format would be the most intuitive viewing. Click a day then view available times. Not sure if that kind of graphical format would be beyond what's possible or easily doable.
Additionally one should be able to view who volunteered for a room. That would eliminate a lot of potential conflict and make it easy for other members to regulate each other rather than the onus being on the board.
P.S. The room booking system is the best thing to happen to the space since the laser cutter. It's so nice to be able to just get in and work when planned rather than leaving frustrated.