Hi, thanks for share your opinion with me, I'll try moving the rx battery to the space beetwen the fuel tank and the servo tray, let's wait what i found during this process.
Can you tell me how you get access to the back of the firewall, i want to do the same as you didN but i don't want to cut the cover film or wood. Is there any way that you show me photos of all the improvements that you make to this plane?.

Best Regards.