Agreed. Wiring touches everywhere in the car, so as you do it, you will note what needs to be done in every area of the car. Wiring is also behind everything else, like carpet, trunk panels, etc. Wiring is also the last part that you will be debugging when everything is together and the car is running.
I reassembled by '72 over the last several months. I did not have much of a plan, just start tackling projects one by one. Inevitably, I would need to order a part or two, then start working on something else until the parts showed up.
Ultimately, these are very, very simple cars.