Well I'll say cassette quality can never really be good becaise of the slow speed and narrow width. . But 1/4" tape is about the best analog quality you can get (feasibly cost wise) if you go 15 IPS and half track (1 way play, no flipping).
If you want good sound for cassettes you can't beat a Nakamichi deck, best there are.
I was very lucky in that I can repair most cars. It's a lot harder now. Before I had a real job, all my vehicles cost less than 3k. If you learn what to look for and to stay safe (brakes, tires) you shouldn't really be in danger with a used car. Now in an accident, some ass in a 30 foot tall dodge truck will kill you, but that's kind of unavoidable even if you're on the sidewalk
That's awesome ! My dad had a Renault back in the 70s air cooled...which is super weird for living in middle of nowhere. He overheated it eventually haha