The other thing to watch is the transfer of the weight through the fuselage. VC Braddock suggests cyno carbon tows to strengthen the cabin frame. I made the top cabin frame verticals wider and then extended them down to the bottom the the fuselage. The ogrinal has the cabin verticals as 3/8 sq 'butted' onto the stringer and then angled in slightly. I cut from 3/8 sheet a section something like the attached picture. The top angle forms the cabin strut and the lower part extends down into the main fuse. Probaly clear as mud!