After avoiding the subject of redoing my work I finally did what any man does in this situation. Yeah, that's right I went shopping, for tools, at the nearby hardware store. I went in to buy Kreg pocket screw jig (got one) and look at sawhorses. Now I own a pair of these back-saving items. Then I noticed a $50 jig saw much better than mine which is 20+ years old. The saw was marked down to less than a bottle of Scotch so I got one.
Oh my! The new saw and new blade cut smooth, fast, and easy. My wall spars are all redone now. Four pieces to clean up and attach to wall top edges. Then I'll line the walls up and clean up the edges. Then I'll cut the front panel that goes below the curved transition to the roof. Looking forward to making some progress now that I can work more easily without having to bend over my work.