Beautiful work!very nice design too.
Is the carcass all miter joints? That’s great skill. Did you glue them? Is there dowels or biscuits or anything holding them together?
The one I did is just glue on the miters but I wish I had the skills and tools to reinforce them
The outside corners are indeed all miter joints. In hindsight, I'd do splines. I did reinforce the bottom miters with dowels, but the top miters were tight enough that I felt comfortable with just glue.