The GC fee for a standard build is going to range from 18-35k depending on the builder per house.

depends on the market, Typically we use 75% of ARV minus repairs and the fee you would like to make.

If the interest rate on their loan is low enough then the payment might be somewhat less than what you'd pay on a new loan today.

You will always use a title company but depending on the state it will determines if they will handle the closing. 

After the interest rate hikes of late. 

I lend money privately and would never consider this as it is dependent on things out of my control (permits, neighbors, you being a good host, rental demand etc) I sell a ton of STR that are in actual resort communities and have great amenities and they are all  competing for the same guests, I can't imagine that there is a need/demand for this type of unit.

If you are raising money you will need to register the exemption with the SEC, and it will depend on whether you are using accredited or non accredited investors. 

Offer to pay their hourly rate to sit down to answer your questions.

There may be additional zoning or building requirements depending on the number of rooms in the unit.

I hope the number of homes for sale increases in the next few months along with a slight decrease in Mortgage rates.