Having used up my monthly allotment of profanity, I decided to ponder the motor box issues. 4conclusions:
1) it is easy to mount the motor to the motor box before the the motor box is attached to the airplane
2) it is almost impossible to mount the motor box to the air plane with the motor already mounted
3) it is a PITA to mount the motor box to the airplane without the motor attached
4) it is much more difficult to mount the motor to the motor box after the motor box is attached to the airplane.
So I decided to go a slightly different route. I screwed the motor box bolts through the T-nuts from the back. They now serve as alignment pins for the motor box. Mounting the motor to the motor box is now much easier as I can access the stop nuts through the hole at the back of the motor box. When I am satisfied with the motor location, I need to replace the current motor stand-offs which are too long, I will glue the motor box to the fuselage.
i also posted photos of my modification to the tail servo locations.