Thanks Everyone!

Kenny, I've got more pictures of it, but not sure if I ever captured that specific piece.  I can check the raw video files to see if I caught it anywhere.  Basically, they're mitered, but screwed in from the bottom (with threaded inserts in the angled pieces).  I think that's what I did, anyway... this was like 5 years ago now 🤣

MosquitoMade.com