100/sqft on a full gut sounds about right - This includes new roof, siding, windowns, electrical, framing, etc - basically everything besides foundation and structureFor a more cosmetic rehab with minimal expenses and alterations to electrical, plumbing, etc you are looking close to 50-60sqftFeel free to reach out anytime and I'd be happy to see your numbers and the project. 

Of course there are discounts for security measures, gates, guards etc. that everyone would get but homeowners premiums are derived on so may factors such as insured age, household members, claims history, ROOF AGE, age of the home, scheduled property, pets etc., so if each home is individually owned this would be near impossible. 

You're talking needing plans, architect drawings, engineering study, a zillion permits and inspections.I just don't see a lender lending on this kind of deal without that person having major experience that includes some ground up or extensive rehab work.If you wanna "break in" to the financing world, it is not impossible at all. 

If today's world, are you factoring into the cost of inflation for the remainder of your life?

If legal, is there anything specific that I need to include in the agreement other than the sale date and sale price to make it ironclad ?

And then separate bank accounts for each LLC, I believe including each series.

I do not know of a BRRRR opportunity that doesn't have a life cycle that costs less than like 22k including all out of pocket expenses and that's if your purchase is around 75k - 90k.When I am setting up a market for my clients, first thing I do is call some agents in the market. 

- your team/ability to do the rehab probably most important factor here

Debt included.

They can know sellers seeking a quiet transaction, or they might have information about off-market properties.Because off-market transactions sometimes include personal circumstances, keep in mind to approach potential sellers with professionalism and sensitivity.