Even with those variables.

The way I look at it this just introduces another tradeoff variable - risk.

You can use 75% of that $2000 to help you qualify   $4000 + ($2000 x 75% ) = $4000 + $1500 = $5000/mo is usable income to help you qualify for the home purchase.Now, there are many other variables to help you determine your purchasing power, but it really does depend on how much eligibility you have left, what your BAH is at the new duty station, and if you have a history of being a landlord over the last two years.As I mentioned, I'm a lender that helps a lot of active duty and veteran folks.

I know there are dozens of variables that need to be considered, but purely for estimation purposes, are there general buckets that can be used?

Rentometer will also give a general idea based on location, beds and baths, but there are other variables (condition, finishes, etc). 

For organizational costs, I don’t think it would be necessary to set up an entity at the outset, but that depends on how you are going to finance the property and a few other variables which a tax advisor/attorney would need to know in order to properly advise.  

As such, analyzing a situation and accounting for variables to determine positive cash flow (Math!) 

Often the interest rate is variable, based on a factor of LIBORThe loan amount will be 70-80% of the purchase price and typically 100% of the renovation amount.

It's important to note that some of these expenses might be variable, while others might be fixed.

It is a variable payment.