I'd like to ask you, as a real participant in your Uncle's world, if you'd be interested in turning such an experience into a "poetic license" type historical screenplay. As a Dallas resident who has seen a few ups-n-downs with Deep Ellum, I think what you describe could be really compelling not just from the "car in an apartment" storyline but for the people who inhabited that sphere. Just a thought, thanks for chiming in by the way, was great to read!
Edit: Forgot to add my Dad's family was up 'n down California for a long time and I had some fun hanging out in Malibu with a Tio who was a Hollywood stunt man for many years. History is quite a trip.