Email Jim Reith at: [email protected]
He runs RA Cores (the original manufacturer of the Gremlin), and should be able to supply replacment fuselages.

If that doesn't work, go to: http://www.tandlfarm.com/catalog67440.html
American PVC pipe is at the bottom of that page along with ordering instructions.

For nylon bolts, take a look around: http://www.microfasteners.com/catalog/products/NYL.cfm
I've ordered from Micro fasteners several times - their prices & service are GREAT!

One way to help save your fuselage in the first place is to use four 1/4-20 nylon bolts to hold the engine mount plate to the fuselage (see pics below). The bolts allow the engine mount to break away before the PVC fuselage fails. Usually, just the bolts have to be replaced after a crash.



HTH,
D