I do very similar to Greg with one exception. I use a Dubro "Ball Link" (the kind with the actual "ball post" and the cap that clamps over it), a piece of threaded rod, a nylon quick link and a horn. One horn and quick link instead of two. I place a small piece of ply in the fuselage side to epoxy the "post" into. Do use epoxy to mount the post if you try that method.
A *touch* of offset can come in handy in some cases.
Bill <><