An entirely #ontoolCAD project, I used double sided tape to hold it down, and the rectangle tool to create a slot shape. (by making the radius of the rectangle 1/2 of the width of the rectangle, this gives you a perfect slot)
One thing that I did that was pretty cool here was to put in the engraving bit after the main profiles were complete and "chamfer" the edges with Origin. It's such a small piece and I didn't see a safe way to do it with the router afterwards. (see last picture)
I attached everything with a bit of epoxy.