If we were to split like this on our current development, our engineers would collect 25 to 35 times as much as we paid them on a straight up fixed cost contract. 

So he sold his business to them and signed a lease contract with them and now selling the building.

They have their own payment platform (you could use Stripe... or GuestyPay), they have their own dynamic pricing (you could use PriceLabs... or GuestyPricing), they have their own smart locks (you could use RemoteLock... or GuestyLocks), etc. 

Also want to add that she had multiple violations such as having a dog with her while her contract states no pets and she was contacting repair facilities and acting as my agent or pretending to be a property owner and interfering with repair process. 

I was feeling paralyzed making decisions about what to do, and no joke within 3 weeks of finishing this book I had decided on my next step and was under contract on my first flip property!

We actually got our one duplex under contract while my wife was about 8 months pregnant.  

Have contracts that provide working days per task and include the overall construction schedule.

Is that possible or smart to do so? 

We need to establish a contract (or shop around for reputable companies that are willing to do this).

Several doctors and lawyers and other smart people literally crying on the phone to me as they realized their whole retirement plan was done and they need to work into their 70’s if they wanted to retire.