I work as a property supplier to a few of these "turn key" companies and while I know of several that overprice "turn key" properties, the companies with which I work do not.

If you need someone to find suppliers and manage the job then it is a set fee to start, plus a % of the job.

Even though it may be more expensive to let the concrete sub supply, it may be a better idea in the long run for warranty issues and easier coordination between concrete sub and supplier. 

Build alliances: Align yourself with suppliers or subcontractors who can assist in delivering materials and services when required.9.

Well, in that you really lose everything.At a lower level, a personal liability suit can hit you for more than the property is worth, the risks you mentioned are very minor compared to the possibilities.Don't intend to scare you off, but in RE you are dealing with the public, you are a provider, a supplier of services, you take on legal and social responsibilities unlike being a consumer in the stock market.

Be realistic and allow for a buffer to handle unforeseen costs.Get Multiple Quotes: Obtain detailed quotes from multiple contractors or suppliers for the required work and materials.

We broker deals and are also a supplier of cabinets and flooring.

They know the in's and out's of city government, have access to good trades and suppliers.

(for something they paid for and you did not have to do anything except make a phone call to the supplier).

Think what your wife does when she goes into the hair dresser, she has at least a couple of pics of what she wants and at least 1 pic of what she doesn't want.I would recommend talking to a local building materials supplier.