ta da!
I've got it mostly back together. Following lawdog's sensible advice, I added a bit of styrene strip as a flange to give more surface area to the joint.
The snapped off forward antenna still isn't on—I'll probably recreate with brass rod, as that's a pretty fragile and exposed item, and it's a bit too thin to get a pin in. Below the cowel, you can see one of the brake lines that fell off.
cheers
-J