As I said I'll be flying my BL to drop R/C Skydivers: I needed to fit a drop box and I wanted it to be recessed inside the fuse rather than being bolted on externally.
The only available position was not as close to the CG as I wanted but after a word with a fellow modeler who owns a BL we decided that it was not a problem.
I took the alumimun drop box I had and made a lite-ply version to bury inside the fuse:
I also added a lite-ply floor all around the box for added strength:
I then checked the ground clearance and it turned out more than adequate:
