Greg I get your frustration, and even after you get the stuff done on your current house, then you will likely have signifigant time away from car activities because of your planned move and setting up the new house.
My advice is to not burn yourself out doing chores. Work on your house for two weeks, then take a whole week just to work on cars. You can do that; you're retired and your own boss, besides you never know when you are going to fall off a roof or something, and be sidelined.
I once took a break away from racing and cars to focus on work, and it turned into over 30 years away from the hobby. And now I believe, and feel lucky that I am still able to, and back again racing again, even if it is not as serious effort as years ago. Point is, particularly at this point in life, retired, you should try to balance the must do's with the want to do's because tomorrow is never promised.