We did 18 ft eves so pretty much exactly as you describe. In the event you want any pictures or insight into what I would do differently just send me a PM. I can send you pix of any part of it you need. I have a full two bedroom apartment in it, a classroom that seats twenty, an instructors lounge which has a full bar and pool table, a two post lift, and the standard equipment stuff, mill,lathe etc etc. it is very efficient. And functional. I can easily store three to four cars in it as well.
