Lets say the interior walls are another 80 linear feet on each level than I'm at 400 linear feet total for walls(this doesn't exclude doors and windows so that should give me enough surplus for the job)  Since they are standard 8 foot walls that means I'm looking at 3200 square feet to cover the walls (400 x 8 =3200)Then the ceiling on both levels is another 900 square feet each (each being 30x30 in this simplified example) which means that's another 1800 square feet for the ceilingTotaling 5000 square feet for drywall and insulation.

I know massive surpluses are common in my home State of Indiana.

For a buy and hold strategy, you're offer will be based on what you can rent a house for (unless you want to play the appreciation game) Homeowners debt, the value of the house, and how much you can buy the house for are three separate figures, obviously the amount you offer them is contingent on what you think you can sell it for; and what they will accept as an offer is contingent on what they owe on the house.In some states when a lender forecloses, and there is a surplus after selling the house, the former owner can apply for these overages, never been there, don't know he process.I'm not even sure if I answered what you were asking, your post was a little confusing.AndrewEdit: Trying to clarify my thoughts, still confused rereading OP

In which case my capex budget number has a significant surplus.

When interest rates aren't at almost zero it's definitely worth having an interest bearing account for surplus funds but 1 account per property is just so much work.

I don't see that a surplus of money is the problem here though.If I'm a financing partner and you have no experience and no money, why am I going to give you $100,000 of my hard earned money.

Because of the Bar & Habitational exposures, it may end up going through the Excess/Surplus Lines (Lloyds of London or similar). 

But that's a WHOLE BIG THING and if you are working full time and making money, in my opinion you should do that and put surplus earnings into passive real estate.  

I don't know the size of your market or whether there is already a rental housing shortage, or a surplus.

Erie Insurance will do what you want, so I am assuming that you are getting the "surplus lines" from somebody else.