1. Where do you find buyers? I'd be concerned about inventory either piling up or taking too long to sell at a price that even breaks even when you are spending time/money on fixing.
2. Do you feel your value-add is more on the sales side as a broker or is it in the repairs? I know people who just flip cars and do extremely minimal "freshing up" and are also profitable/successful.
3. How do you keep up with the increasingly locked down and opaque ECUs and other systems? More and more diagnostics require factory wizardry these days.
4. You implied that you do paint and body work. Where/how did you learn and become proficient? Most auto repairs are pretty much "follow the steps" work anyone can learn from YouTube, but body work is artistry.
5. Do you worry about liability? I'm OK fixing my own car since if I screw up it's my ass on the line. I'd be less confident in sending the car off to grandma, even if I knew what I was doing.