Any insights on rental demand, tenant turnover, or local regulations?

You are already succeeding by living for free, which will increase what you can save for the next investment.1-2 years later, buy another one and turn the first property into a pure rental.

At the moment, I have one SFH rental in Fort Worth.

They will let you know what you can and can't do without a permit and what you are able to do yourself within the scopes of those permits.My concern is because this is a rental, if you do anything that is not to code and the tenant reports it, you will likely have some much bigger issues to deal with.Given you note this is major rehab, I tend to lean to hire most, if not all, out. 

I handled our rental unit renovations, but they weren't huge and this seems an order of magnitude greater.  

180 SlipsFuel DocksYacht ClubShowersBy improving facilities I’d imagine slip rentals can be increased.

I learned how to manage rental properties well with this property.

The Rental Property Association of Wisconsin has monthly meetups, next one today RPAWI .org

South Carolina (where I live) is a great state for many things but not rental real estate.