I've had luck using ejector pins cut to length as hinge pins. I also had it captured by cutting a mortise into the pin and drilled/tapped a 3mm hole into the bulkhead so a setscrew can hold it in place..
You can check my gmaxx build here:
Castle Neu 1520 on 6S LiPo Powered Gmaxx (Nitro Killer)
Predator with OS .21TM
Supermaxx with Mach .26
Revo with OS .18TZ
Kyosho ST-RR Conversion
Ofna CR with Tekin ESC/Motor (2)