We just bought a horse trailer with a 4 foot short wall. I have been looking into converting the dressing room into a finished living quarters. How is the best way to frame up the walls and ceiling. I plan to insulate and wire it but the framing is stumping me since the roof curves down to the top of the walls. IT seems to either lose about 6 inches of head space or 4 inches of space per wall. any pictures would help.