Does anyone have any experience with the cost ballpark and requirement to do this with a single residential (not multifamily complex)? 

Also, require the tenants to have renters insurance.

Many large financial institutions are fond of the build-to-rent industry because demand for housing is strong and because new constructions require less maintenance and are a more predictable investment than older homes.

The biggest change will impact seller finance lenders who will be required to be licensed as a mortgage company once they exceed 3 loans in a consecutive 12 month period and will apply to all entities they use.

If the income is insufficient, the borrower could be required to put more down to make the ratios work.

The larger projects I am looking at, would require more funds (probably around $500,000) and a longer hold period (3-5 years). 

Most lenders will say no upfront, but some can do cabins if they meet certain requirements.

But yes, that requires learning a lot and taking initiative.

Because construction is like herding cats, financially and time wise.Your architect never mentioned this special ceiling requirement? 

After assuming average repairs and maintenance, you’re AT BEST negative cash flow of $600 per month.