In particular, are there any can't-miss do's and don'ts in terms of marketing and preparing the STR for guests? 

If anyone else has creative ideas for how to make this work I would love to hear them! 

The potential buyer needs about 6 or so spaces and I'd like to have suggestions for creative solutions to achieve both objectives.

The fact is someone was able to come up with a more creative solution for the seller than you did, and acted on it and got the property.

Hello,Does anyone have any creative ways to finance home improvements?

Does anyone have any experience coming up with creative ideas for acreage located in a flood plain? 

There are creative strategies out there, I think one worth exploring for this particular scenario is the "subject to " .

I know there are many other ways to fund a project such as a partnership or other forms of creative investing, but I will need to fund almost the entire purchase using debt. 

-Demo kitchen cabinets-Remove all fixtures-Demo old bathroom tiling and fixtures-Have digging/tunneling prepared for sewage line replacement-Pressure wash outside of house to prep for paintWeeks 2 & 3-Complete sewage line replacement-Begin Landscaping design-Replace entire homes fascia boards-Remove popcorn ceiling textureWeek 5-Have exterior of home painted-Roof leaks should be repaired by nowWeek 7-Have new lighting and fixtures installed-Tile Flooring throughout installed-Replace drywall boards as needed-Paint interiorWeek 9-Kitchen cabinets/countertops and island installed-Bathroom tiling completed-Shower doors installed-Detail work inside-Electrical outlets upgraded-Front Door replaced-Vanities/bath fixtures installedWeek 12-Install appliances-Install Fencing where needed(using about 80% of the neighbors white pvc fence as a privacy, will match)-Paver driveway to be completedWeek 13-Stage for marketing photos and open houses-Accept offer at 110% of list priceI know this is a brief run over of the work, but any advice in planning/ executing is appreciated.

Can you do land contracts in TX?