Also the quote that I got the material cost is ~2x what it should cost (I called a local supplier for gravel).

The reality was that as I began taking action I realized a few things:1) BRRRR has some risks associated to it that can be easily overlooked by new investors (calculating ARV, managing rehabs, etc.)2) Hard money is freakin expensive (not the low money down I needed)3) Lack of experience makes it very difficult for HML's, Contractors, and Property suppliers (wholesalers) to take you seriously. 

There are shower doors at Home Depot and there are shower doors at high end suppliers - totally different products.

Contacts, suppliers, sub-contractors, local permitting and zoning process knowledge.... [5] Do you know the local Lien Release procedure and how to CYA on this--b/c it's important.[6] Do you know how to slump test concrete, and your potential partner does not, or vice versa...compare skills,,,and try to fill in weaknesses vs duplicate strengths.

Contracting Agreements: These may include service contracts with vendors or suppliers, maintenance agreements, or agreements with any on-site staff.

Different suppliers for different styles of houses. 

I'm just thankful I was able to buy my packets instead of having to go thru a hotel supplier. 

It can really help you see where your revenues and expenses are coming from and try to find areas to exploit efficiencies and even negotiate with suppliers.

Account Closed, I suggest you contact a few of the local Hardie suppliers in the area and seek some installer recommendations.  

I let the supplier pick for me, knowing they wouldn't sell what they couldn't service.In time we switched that place to separate utilities & hook-ups - we got rid of the coin-ops.