@Marian Smith yes, my roofer used a rigid foam product that was pre-fabbed to produce the desired slope; you can search generically for "tapered roofing insulation" and should find suppliers in your area.  

I've seen the steel ones from the usual suppliers (Menards, Home Depot, etc.), which may be an alternative.

Get recommendations from suppliers for good, fast, quality people.

You’d be surprised how often used (2-4 years old) units come up in online classifieds from a reputable supplier.

So pay for materials direct from supplier, only paying the worker Thier wages.

They would have to execute a new agreement with the supplier as well as a new connection fee

Then we a deal comes along you will spot it quicker than the competition.You can continue to work on your cash reserves, your credit, your network of other investors, end buyers, suppliers and advisors.

His cabinet supplier should have a designer that can work with you for free.I think his electrical is about $5K too low if he is replacing all knob and tube wiring and updating panel.In regards to flooring, if you are selling the house avoid cheap flooring.

As has been, mentioned, water is the biggest enemy....And don't worry about the warranty too much, they only cover materials....so if there is an issue, the supplier will just drop off a couple squares of shingles, that's all.

You can probably find another investor to do this.2 - Establish contractors credit at all of your suppliers, with 30-60 day no interest (suppliers like giving incentives at the start).