Take down barn siding, sand it, and then stain it. What you end up with is some of the nicest wood to make walls with that I have ever seen. Take the beams and have them cut into boards. Sand them and stain them and presto chango you get the same result, some of the nicest wood for building bookshelves that I have ever seen. Or just a cleaner on the siding boards and then seal them with polyurethane, once again great looking wood!

Also, go ahead and put your ceiling in (not a dropdown though).Insulate theunderside of the floor joists and put your wood or drywall ceiling up.
Use low voltage lighting behind a soffit along the ceiling and you have great lighting for movies.