I trimmed the cabin fiberglass shells to fit to the air frame without any interference. After installing all conrols and fuel lines, there were quite a few areas where trimming of shells was necessary.
Still have not decided , if I want to cut out the entire back of the cabin shells to make a access to controls easier. This would also eliminate the installation of the piano hinge to connect the two cabin halves there. I'll decide later, I guess. I can always cut it out later.