I got the arms on the chair, with the help of a couple clamping jigs and some simple techniques that I never would have thought of, the arm face to the back leg face is a perfect match.
 

I didn't get very good shots of the process, so any explanation would be futile, sorry, the clamping jigs are all on the other side, don't know why I took a pic of the glued up arm instead of the one that was being fit to be glued, duh!
 

The above pic shows how the paper is moved back n forth, I sand one side, then flip the paper over to sand the other face, bringing both faces of the joint into perfect compliance. While sanding, I am bending the paper away from the grit, so the paper doesn't put a curved edge of the joint, destroying the joint immediately.
 

The final fit, perfect, ready for glue up and later, shaping.

 

Man that chair is looking good. Very impressing on fitting the joints. Those are tight.

John

I agree!