I love the concept but rattle can that old pop-up!
I saw them build a much bigger 5er on extreme 4x4 with a similar set up... of course all their stuff was new.
I have been checking craigslist daily just in case some one has an old trailer that needs work. Ironically my dad said one of his buddies has an old 70's style pop-up sitting in his backyard. Waiting to hear back! I don't care if it's old, I like projects.