This is why I am really thinking things through instead of sawing and gluing in a piece.   One other thing I didn't consider, if I move the box back a bit, then I can no longer put the battery pack in, it would push the CG towards the tail.  Going to give it some more thought to being convertible, yet strong enough for the 4 stroke.

OTOH, I could always get a second fuse and bash that one instead since nothing is installed on it.  Just swap wing and tail.