Curious, with provocative titles and the gory details,  is it your intention to form a  short term rental  investment business?

If the numbers are projected (pro-forma) then you’ll want to reference then again other sources, for example property managers and online rent rate tools for market rents.Another thing you must do is make sure the numbers you’re being given include “soft” expenses such as vacancy allowance and maintenance & repairs.

If you'd like to do this properly then I'd say form a company with your direct lender where they are active (easiest way) and your new company can lend to your potential flip clients.

Brandon Turner himself he mentions he will almost never cash flow form a 1% deal. 

I'll tell you this, on any given year I have some units that perform better than my pro-forma and some that perform worse.

Whats the best way to account for capital expenditures on a 10 year pro forma?  

You can force the appreciation of a commercial rental based on bumps in net income - but non-commercial rentals are appraised differently.2 - One work around for getting credit for your Airbnb income (a tactic I share with those who take my Airbnb for Landlord course) is to form a trust and appoint a trustee.

While you do not have to be exclusive, it will form a stronger relationship and you will get better deals from an agent you use exclusively. 

I am studying land development and want to produce a pro forma for a large residential subdivision.

By providing capital to another party (who must be unrelated to the IRA account holder), and simply receiving interest on the loaned money, this becomes a passive investment transaction not subject to UBTI.For some investors, it can make sense for the IRA or 401k to form a "blocker corporation".