I'm doing it all at the same time. Being that I've built everything (with friends help) it's taken a while. The cost savings as been substantial. I've had the motor mocked up and machine work completed, Trans assembled and fit,rear axle narrowed and set-up. All are apart now for paint. the body will get sprayed this weekend. Then assembly. Hopefully mocking everything up during trial means it will be a smooth build. I think it's easier to finish it once.
Doug