Are there lenders that will lend on the product at competitive rates that are similar to current 30 yr sfh amortization?

This transaction is of course VERY unusual, but I have done similar deals for 20 - 50% real discount over the course of my investing career.2.

Do you have 2-4 contractors that you've built relationships with who build similar homes to what you're looking to do?

That sounds pretty straightforward and we've got something similar here too and it's not bad. 

The typical clients that seek out cost segregation studies include:Real estate companies that buy and sell multiple properties each year.Individuals with a portfolio containing investment properties including apartment buildings, multi-family homes and even single residences.Franchise owners with properties that are similar to one another such as assisted living facilities, storage facilities and golf courses.Business owners of hotels, food facilities, shopping centers, restaurants or manufacturing plants.It depends on the type of property, but generally 15-45% of the building’s costs can be classified into assets with a shorter life.

Basically if there is no "living room" and there are no comparable properties with similar square footage and bed/bath count in your area the property becomes difficult to comp or sell and lenders will not be able to use it as collateral for a loan Excellent point.

(The other scammers are from posts here on Bigger Pockets from people with similar situations as mine) McMann Commercial Lending, Walter Trock & Michael LanzaGenie Investments - David Hughes and Mike ConnerSilversky capital out of Lubbock, TX.Jerry Yang and Guatam ShahSmartZip - Smart ZipAmerican Money Loan ServicesTom Vanderlaan.FLIP AND FAST LOANS LLC.Also read this post.

I've also read about Doorvest, and they are trying to make buying a rental property similar to buying a stock with a broker.

Very similar to direct mail but much more cost effective.

Had similar situation when I responded to a short sale.