Ironically, it was not originally intended to be a theater, but a tennis court. (You can see the long rows of box seats on either side where an audience would have watched a match). The Lisle Court only became a theater in 1662, before being temporarily closed during the plague in 1665. [There may also have been a murder that occurred there, but somehow that tale has only recently resurfaced :-) ]
In doing my research, I came across the work of Steve Bouler, a theater professional and academic, as well as being an extremely talented designer of virtually reconstructed theatrical playhouses.
It's hard to express how immensely helpful these reconstructions are to a researcher. Since so many of these Renaissance and Restoration playhouses are now gone, we must rely on extant sketches that can be difficult to track down,and even more difficult to interpret.
I know I spend a lot of time looking over faded sketches with teeny print, trying to figure out how everything fits together. But when I came across these reconstructions, I gained a far better sense of how plays would have been staged (and received). You'll understand when you check out Bouler's amazing panoramic reconstructions! Check it out!