If I like very much to work using routers and Dremel, doing the end graft inlay by hand still a nice challenge, and more over when the inlay is perfectly rectangular and have to match the one on back. Doing before or after the back is already glued have both their pros/cons. I’m doing before the back is glued, but after that the back is already prepared and ready to glue, so alignment is not really hard to get.