If you use the suggested .91FS then the firewall is not an issue. The pictures shown of the firewall ripped out are the result of a crash when the pilot flat spun it and pancaked it into the ground.

Also those that have overpowered the plane buy putting anything more than a Saito 100 should think about reinforcement. I'm still flying mine as it came out of the box and have had no issues with the firewall. I would check the gluing of the servo tray. Mine came loose after about 25 flights but i detected it before it caused a crash.

The only gripe i have with the ARF is that the checkered covering under the wing is not MonoKote like the rest of the covering.