Ian, I keep myself enthused by finishing stuff before it’s necessary. I have two beautiful SU carbs with manifold and linkage all finished and screwed to my work bench and it could be two or three years before I need them (by then I might have to re-do some cork washers but I’ll worry about that then) but they’re nice to look at so I rebuilt them. Motor sitting in pieces though.
At the stage your car is I’d strap in the fuel tank, with hose, cap, sender, etc. I’d wire rear lights and run the wiring harness in to the tub and leave it there til later. Then put in the hardboard wall that hides the tank and then the carpet. Then put on the hinges and handle and that rod that holds the lid up. When finished It’s a nice place to put stuff too, if you have a messy garage like I do.