There's something about a clean miter.
I'm reinforcing these miters with L tenons, aluminum angle with some wood strips glued on. Another idea borrowed from Fine woodworking magazine. Here's the lamination with eco-poxy glue.
Then trimmed to fit at the bandsaw.
It produced a perfectly square sub-assembly with a seamless re-sawn joint, this is straight out of the clamps, ready to be cut into lengths.