At least by updating it if you should go to sell later you may get higher offers reducing or even eliminating your risk of a loss at sale. 

I put killz all over the walls, will probably end up replacing the trim boards, and drowning the corner in some kind of enzyme eliminating solution.

Rip off the wood, then rebuild the flooring (plywood + top covering)- eliminate the source of smell 2.

Could eliminate the self employment tax on the flip. 

See that eliminates that option for me.

The financing for this deal will likely be tough: it is rural (most lenders don't touch), Airbnb (VERY few lenders will do rural STRs), and a mobile/tiny home (which eliminates pretty much all private lenders).

.- Minimal Hassle: Seller financing eliminates the need for bank involvement, reducing paperwork and streamlining the sales process.- Assured Sale: Choosing seller financing may attract a broader pool of potential buyers, beyond myself, increasing the likelihood of a successful sale.I believe that by working together, we can find a solution that benefits both of us.

You can't completely eliminate risks, but you can always lower it to protect the cash flow!

There are ways to structure different DSCR products to eliminate UW fees and origination costs or wrap them into the loan. 

Specifically:- Are there any exceptions or tax treaties that could eliminate or reduce my US tax burden on foreign rental income that is otherwise taxed locally?