If I were to mass produce fuselages I would do it quite different. I would build a steel table and bolt it to the floor. I'd create a cage that opens up like a clam shell to build two sides. A simple hydraulic would close it and the other stations would get welded in. Those would be held in by lightweight removable fixtures. When done, the clamshell would open and you'd pull out the fuselage. However, it wouldn't be a Cassutt. It would be my version of the Vagabond. If I were king........ lol.