The building is designed to have the roof and second level lift off. Here's some pictures of the ground level showing the main seating area. The chairs are a set of MDF "tavern chairs" from TTCombat That I glued together to make rows.
This is the stage area. I had originally thought about having dressing rooms, etc backstage but decided that would interfere too much with playing area and so just made it cluttered. Also I made the scenery flat a bit smaller than it should be, again for playablity.
Here's some close-ups of the second level boxes and the balcony.
Finally, here's a shot of Mrs. Lovett's Meat Pie Stand. If you are familiar with Sweeney Todd, the ingredients of the pies are somewhat less than appetizing.