Thanks, Don!
I cut the notches 2 different ways. For notches in straight timber (carlings, for example) I marked the location on the timber, set my Byrnes table saw blade to 1/16" cut, then passed the timber over the blade with the miter gauge, nibbling away the wood. I used files, small chisels and the X-Acto knife to fine tune the fit. On the curved pieces, like the arm beams, I nibbled away the notch using my scroll saw, then files, chisels and X-Acto.