I am not an engine builder, nor profess to be a car builder (I try), but I am a builder of buildings and have literally built a $250 million project on a hand shake. The lawyers didn't even finish the contract until we were almost finished and then we both agreed to put it in the files and not sign it.
Why is that? Because business is built on trust and reputation. It's all you have and should be treated as such and more important than a credit score, line of credit etc.
Hell, what do I know.
My 2 cents...