The Chocolate Factory's quite good with its admittedly limited space.
Within the confines of their theatre, they can make the stage as big or as small as they choose. When I saw 'Total Eclipse', it was basically a short catwalk bisecting the room (if you imagine the room in landscape format, the catwalk ran vertically) and an array of chairs on either side. When I saw 'Take Flight', half the room was given over to raked seating, and the other half *was* the stage.
When they do musicals, they always seem to put the band up high, get 'em out of the way. There were 7 for 'La Cage' and 8 for 'Take Flight'. So if they want to build their up-high platforms bigger, they could certainly fit more musicians in. It'd cost more though. :P