Some of the costs quoted shock even seasoned flippers as they are lower than even material are in many markets. 

That's not exactly a good alternative to sub to. 

(Currently our rebar supplier is behind 2+ weeks and these materials were ordered 45 days in advance). 

Alternatively, explore a self-directed IRA to invest directly in real estate without triggering taxes or penalties.

I'll look into that material more!

I don't think anything anyone offers is "evidence" in court because you would be backing up your claims with documentation such as the lease, or quotes for work or material prices.

Alternative rent models (STR, MTR, rent by room, etc.) do not necessarily do better and are more work.  

An alternative could be putting all your properties under one LLC to start, then reassessing as your portfolio grows.

Perhaps slightly higher from an alternative lender but definitely not from a credit union and expect much higher fees.

Despite the inability to claim depreciation or avoid certain taxes, many investors appreciate the control an SDIRA offers, allowing them to invest directly in real estate and other alternative assets they are passionate about.I do not recommend buying tax-efficient assets like RE in the already tax-efficient IRAs.