I got the airplane back today. In short: It needs a bit of TLC but after that it'll definitely fly again.
Unfortunately, dope appears to have been used so I had to work a little harder to get the tissue off, but for the most part it came off pretty well. The guy said to leave as much tissue as I could; he will try patching it, but if it doesn't work, it'll just get new tissue.
For the fuselage, the majority of the damage was to the second fuselage former; it's broken into 5 pieces and one of them is missing entirely. Two of the longerons are also cracked and one is gone completely but those shouldn't be too hard to replace and fix. I think I'm going to repair the mangled former in situ; taking it apart to install a new one would involve rebuilding most of the forward fuselage, which surprisingly has zero damage whatsoever. Building a piece to match the broken one and then hitting all the cracks with thin CA after jigging it to keep it straight should clean it right up.
For now I concentrated on the wing which presented some challenges of its own. Here's what we're dealing with; pretty clean breaks on everything. Easy to repair, but I took some extra precautions to keep the wing strong while minimizing the weight gain.
The broken spar required the most work. Just fabricating a new stick and gluing it in with butt joints on the remaining bit of spar would just be begging for an in-flight failure. So first, I got to work clearing what remained of the broken spar out of the sandwich joint between the two spars in the center wing. I got probably 95% of it out, which is fine.
Framing everything up, just to make sure I would preserve the original dihedral angle. I also did some looking and found the piece of the leading edge that broke off, and it will get reused.
Quick and dirty scarf joint on the new spar, to make it as strong as possible. This stick fits in the gap left by the old spar in the wing center section perfectly.
And, after gluing everything back together. The geometry of the leading and trailing edges prevented making effective scarf joints so I added 1/32 square ply braces to them; the wing feels just as strong as it did originally. They're also impossible to see in this picture for some reason
According to my scale all this work increased the wing weight by just 0.33 grams, though I did remove some tissue and didn't replace it so it'll probably weigh just a tad more than that.
