Sphinx Hut Windows
The windows frames:
Front windows (there's two):

18.25"x32.75"
All these windows currently have two 3/4" thick strips on the inside of the frame, presumably holding the plexiglass in. Both the front windows' width could also be extended by up to 4", if desired. The ground level window at the back could also potentially be heightened, but I neglected to measure how far until the next structural member.
The rear loft also opens, and has a single 1.25" spacer around the inside presumably as something for the window to stop against. There's also no room for expansion on this one, as the window frame runs up against the arched frame of the hut.

