Hi Steve,
Having seen a whole lot of airplanes being built on video by Windy (he does it pretty good), I can say that he has everything as finished as he can, especially the wing up through silver before he puts it all together. I do remember that he puts fillets on the inside as well as the outside of the wing/fuselage joint, and the fuselage is usually covered after assembly. That is, the top and bottom blocks were carved then popped off to hollow and the wing installed so that he could get all the way around the wing joint on the inside of the fuselage sides. I haven't seen him on tape in a while, but he nver had a problem that I ever heard of by epoxying the finished wing straight into the fuselage.
Me, I do all my covering (usually), wings and all, after the plane is basically fframed up. Of course, there isn't any other way to do it with an I beam. (Well actually there is but it takes longer and it's a pain! LOL!!) Plus I don't poke as many holes in the silkspan that way............
Bill <><