Here are some pictures of my modifications. You can see how exhaust exits out the bottom. I haven't put anything on the exhaust yet to make sure it won't come off. Also in pictures I have put 1/4-20 blind nuts in wings and then use thumb screws to tighten up to fuselage.
Works great. You can see I also put some Goldberg snaps on bottoms of wing and fuselage to hold the back ends together. I am still doing other things and will post some more pictures when I get there.
Rich O.