I'm in the process of removing the ceiling using a nail punch and chisel to take out the rivets. It's going slow but smoothly. What method did you use to take off the walls under the windows? How about the flooring?

For the walls under the windows I used a hammer drill and that went quickly and smoothly compared to anything else (was not able to do this on the ceiling due to the larger size). I started with the flooring so probably spent the most time learning quicker/efficient ways to do things. I simply used a large hammer and pry bar to bring up the floor. The plywood proved very difficult to pull up, someone else might have a better idea on that .