Hi Phil - I'm building in a single stall side of a garage, so I have the same floor space premium you have. I was going to hang the wings up high, but it was just too scary for me... I could see them fallling
So I built a very simple cradle out of scrap 2x4s. The wings are top sides together (bottom sides out) and there are only about 6 or less inches between them. The spars rest on a 2x4 platform, and at the other end a single 2x4 goes up between the wings. I used a strip of carpet attached to this 2x4 to hold the wings. Whole thing is on casters and is pushed up against the wall under a shelf. I put a big piece of styrofoam on the outside to use as a plans hanger. Came out good. Although now with the fuse coming together it's getting crowded again. I'll look tonight for a picture to post.
Good Luck,
dave