Back to the router table to cut a groove for the bottom.
Move the fence and adjust the height a bit, and cut the tongue to go into that groove.
Eight of each.
Glue up the miter. The clamps on the bottom ends are only there to lift the ends to the right height.
Splines strengthen the joint. The tablesaw cuts some grooves.
The grooves.
Shave down a strip of wood to tightly fit the groove.
Glue the splines in.
The excess wood is cut off with a saw, and the joint is complete.
