They integrate with my PMS so auto changing of door codes is nice.

That seems like a strict requirement of needing to keep the home for a year to use the owner builder direction, but I would confirm that before fully going forward as the GC. 

Door codes should have never been released by Airbnb without a cleared payment. 

With new construction built to today's code the rates that most investors are finding are up to 40% lower that properties that were built even ten years ago.  

Most Fortune 500 companies now use a 3rd party verification service that charges the employee and requires them to get a code they can then give to the PMC to do the employment verification.

These are professionals with additional training and a stricter code of ethics.

I can tell you to avoid 39209 zip code because it's a war zone. 39204 and 39213 aren't much better.

Easy platform to program guest specific codes.  

The cheapest 3br I can find on Zillow is 1,500$ and rentometer says for my zip code the market rent is $1,8193) I just know he’s been there for 24 years and lives alone, he has two newer cars but I’m not aware of his income situation.  

You can find more info on 1031 exchanges at this link: https://www.irs.gov/businesses/small-businesses-self-employed/like-kind-exchanges-under-irc-code-section-1031Regarding the change of ownership from joint to individual, there might be a couple of ways to handle that depending on your state laws and the terms of your divorce agreement.