Time to start bringing this thread up to date. Most of the posts have gone to the what did you do in your shop today.
Got the hinge made, pinned it in as well as used JB Weld to keep it secure. It opens pretty nice. Just as I hoped. Used the rotary table to get the radius from the hinge pin.
Used some brass coated steel for the securing screw, and then turned a brass nut with a long extension to reach over the ring.
This has just been replaced, so this is the original, and the reason it gets replaced is because I made a bad decision after coming back from vacation, and forgot that I needed to pin it, instead I placed a groove and lowered the height of the rest, so it needs redoing.
This is how much it shifted.
Started on the new blank. Got it squared, had a brain fart, didn't remember you can't fly cut mill scale...
Kept burning up the tool. face milled, and now cutting the new saddle pyramid.