Very nice set up! Thanks for sharing.
I have a variety of corner clamps, band clamps. an X shaped frame, Bessy right angle clamps, steel wires that grab the corners with spring action, and these. These really work well I'm thinking of making some sort of corner pieces to set in the frame to set everything square before clamps and glueup.Those are a much better idea than the standard right angle corner clamp, especially the ones with only one clamp screw.