Well one solution would be to add more fiberglass on the inside, but that would be a ton of work..... A paint job will help mask the edges
Yah i can believe they were difficult to fiberglass lol. Good to see you have the different issues covered pretty well
I dont think there are any pep files for the gun, so maybe you should scratch build it?? Scratch building really isn't too difficult if you take your time and measure things out properly

Its just time consuming....