I bought a 114" P-38 from an estate. The people selling were not RC folk, so not much help from them regarding the pedigree of the plane. I am fairly certain it is a Robart product, when they built the entire H section from glass. While it looks nice, I have determined that it never was flown ... at least in the condition I found it in. Some other intel is that local folks say the original owner flew a couple P-38s, but not so successfully, and that this one might have been involved in a crash.
I'm reworking her from stem to stern, and am involved with the engine mounts now. I've got a fair amount of experience with large engine installation on 3D birds, but zero with composite construction like this one. I've attached some photos of the "firewall". There is a 1/4" AC ply bulkhead that is very open, and the edges are glassed very well into the fuselage structure. The design, as it stands, is that a second engine bearing assembly which includes a second firewall of 1/2" thickness, is bolted in ten places to the smaller thickness firewall (10-32 sockets heads into blind nuts - I'm not a blind nut fan).
The question - do you guys think this is robust enough for a G62 (which is what is in this plane). It seems to me that the smaller firewall would stress that glass a lot with the engine vibration. I'm used to engine boxes that carry back into the fuse structure to spread the load. However, I know there are lots of large glow engine mounts just like this with far less fiberglass thickness that work just fine.
Anyone have experience with this configuration?

Thanks,
Rikk