I’m not saying that it’s not possible, but it’s not good life advice for the majority of people. You’re an enthusiast who knows what they’re doing around a car. You seem to spend a lot of time fixing things that go beyond normal garage shop fixes. Rebuilding a transmission requires time, skill, space, and most importantly tools. Two more things, not everyone is going to have the storage space for a parts car like you’re suggesting. In fact, lots of American towns have ordinances against sitting cars. And second, I don’t trust people to change their tires at the right time. Half the accidents during the first couple of freezes are from people that are essentially driving on belts. Do you really think I should trust people to properly seat their own used tires?

I’m glad that you are able to make this work for you, but it sounds like you have the requisite knowledge, tools, skill, and time to make it work.