I am able to report that I completed the job and I received payment promptly. I did have him sign a contract prior to work being done. Apparently the red flags I was picking up were valid, I was just not interpreting them properly. This guy:
@ Birddogged and micromanaged me the entire job.
@ Didn't understand why I was changing the 30 amp fuses to 15 and 20 amp breakers on his 15 and 20 amp circuits and said he would change one of the circuits back to a 30 amp breaker after inspection because his RV was plugged into it. I explained the fire risk and he said "well nothing bad has happened so far".
@ Attempted to get a discount when paying. (Which is fine. I told him no.) I'm guessing the bogus price he said I quoted was a negotiating ploy.
@ Called to tell me the job failed inspection, then said just kidding.
@ When I asked what the inspector looked at he said the inspector took a brief look and called it good, but then he forced the inspector to look at every nook and crannie of the work done. It was still good.