Hi, I am new to this forum. I have built a few guitars, got diverted off into tube amp construction for a while, and I am really psyched to get back to doing some guitar work
This topic is near and dear to me. I've tried a couple of ways to get a smooth heel on a removable neck. The most recent one uses a joint that is similar to what you show in the drawing, but with a little more complexity.
The joint is a lot of extra work, but I am really happy with it structurally and I certainly have no complaints about the tone or sustain.
It does have some issues related to the appearance that would also apply to the joint you are considering. If you use a surface finish, you are going to need to have a slight gap for the finish to go around the corner and into the joint. It wouldn't have to be all the way through, maybe 1/8th inch. But if you don't do that, the finish will be very susceptible to chipping or peeling. Even if you use an oil finish, your probably would need to put a slight bevel or round on the edges of the joint. Getting the gap nice and even, while keeping it very narrow....that's something I haven't solved yet
Even if you manage to keep the gaps nice and narrow and even, it is going to look a little clunky, having the 2 gaps running down the back of the guitar
Mark