Well, we got the fuselage closed up tonight...
First a piece was made from 1/16" balsa to reach from the firewall all the way to the tail. The proper shape was determined by simply pressing the sheet against the bottom of the fuselage and then tracing the fuselage sides. After cutting the outline it was sanded for a perfect fit all around. Then I marked a centerline across the wing chord and cut a slit in it from front to rear to "relieve" the piece over the wing dihedral area during attachment. In the one close-up photo the slit can just be seen, running between the two red Sharpie dots.
Then it got tricky. I discovered it was going to take about eight hands to hold pressure everywhere that would be necessary during the attachment because of the varying contours from front to rear. I don't have eight hands so I ended up gluing just the front section down first, from across the wing L/E to the firewall. I used 5 minute epoxy, and held it for ten minutes.
Next, I taped off the wing root line on the wing surface and then dribbled CA all down the inside of the fuselage sheet from the wing T/E forward. I taped the wing root off first so that the CA wouldn't ooze into that area as I squeezed the sheet down during attachment. It took all eight fingers
and both thumbs.
Finally, I got out the Titebond and attached the rear section. I used Titebond for that step because again I couldn't hold down it everywhere it needed to be at the same time. I could have probably pinned it but it took quite a bit of pressure to get it to lay down well, and I didn't really want to pepper the thing with pinholes either. I ended up pulling it down tight with blue tape, Ace bandage style, working my way from the wing T/E to the tail.
Boy,
that was easy!