Thank you all for the kind words. Much of the credit here goes to the artist (Escher). I am only the technician this time.
Brian, it was worked out with “analog” technology. Not a pencil so much as mental math. 🤔😁
Scrappile, if you really want to build a chevalet, I’m just in the process of drawing my plywood version up in OnShape. I have all the plywood parts done already and the rest is easy. I never charge for plans so if you’d like some just PM me.
…you don’t have to speak OnShape. It spits out dimensioned shop drawings.

The early bird gets the worm but its the second mouse that gets the cheese.