@Grant Vincent Personally, I prefer to stay at a place that's 100% wood inside, no drywall and no paint, because I want it to be as dissimilar to home as possible.

There will always be more risk with something vacant, you're probably going to be counting on one person as your "eyes" on the project (or at least for "security", overall)- and the more hands on/ closer they live / able to visit site frequently, the better. whether that is your gc, a project or property manager, or your handyman/even yard maintenance guy, neighboring teenager, or whoever- this person is key

A truck is personal property and would not become yours simply because it's on a piece of real estate that you bought. 

If I made any substantial additions to it, I would be happy to share it with the community and give credit to the person who made the original.

The wifi is what will allow you to access the door remotely.If you don't want wifi on it, Then you can still get a smart lock you'll just need to pre-program several different codes into it, and then give out those codes appropriately but you'd need to be on site at the door itself to program initially or update it.From personal experience I find the touch screen or wifi locks to be complete POS's that are not reliable and the battery does not last long.  

The person you sold to would probably have a cause for legal action.However, in Austin, @T.

You could volunteer as a front desk person on weekends and then gradually work your way up into an assistant while you work on your license... 

From my understanding it might have to be a personal loan, which is very expensive. 

Pay off HELCO, REPEAT.If you are an accredited investor I can discuss some Alternative investments I am personally looking at to generate income that offer tax advantages to shelter some income.

Personally prefer SFR..Not sure about DFW but do have a realtor reference for you..be sure to budget for furniture and furnishings if not sold turn-key..a seller concession is a great way to preserve capital for MTR or STR's..check in with @Joseph Chiofalo for an investor friendly lender..he's excellent at helping structure loan programs for investments.