I am the same. with the frame caps welded in place, the inner fender installed, etc., the car feels totally different even without the engine in it...before, you could jiggle a fender and everything flexed and moved. Have welded up and gusseted the k frame as well.
Other than painting everything, it is about ready to go back together...then on to the floor plan
It is not a collectors' car having once been a plain jane 318, but, it should be a fun driver so I can deal with the frame repair, etc. Just irks me that someone would smear bondo over serious rust and rip someone off. Least the engine had not fallen out, but, I suspect one more good thud and it would have....