They might have certain regulations. 

Cast iron plumbing is a pain in the you know what.

From what I've read (I forgot where so correct me if I am wrong) with the regulations required by the SEC for crowd funding it costs $30,000 for every $100,000 raised in reporting requirement costs/costs to meet SEC regulations.

Some such as tile, tree removal, and plumbing will be contracted.The new bank I am working with is a community bank and they explained the interest only loan as a "construction like loan" if after 6 months, I wont be able to use the FHA loan I will shop around for better rates.I have been here for 10 years I am  more than "eligible" for orders.

This is the best strategy identified for me so far....but again, as long as i make repairs...including plumbing and electric, I will still be personally liable so the true amount of protection is debatable.  

I would also like to know how you factor in any potential issues that may arise with the plumbing or the HVAC systems.

Cutting corners by leaving out crucial parts of a system whether it is plumbing or flooring is not acceptable and you will continue to have problems with buyers.  

I'm hoping that maintenance for the first several years will be less than 3000/year as much will be new (appliances, bathrooms, plumbing, furnace, AC, water heater,roof).

Most cities regulation signs even if they're on private property. 

They need to make sure there are no plumbing leaks and that the house is liveable before they will lend on it.