Be careful with this customer! What else won't he "waste" money on? You? Have you worked for him before?
Get names of people he has hired before and talk to them how the jobs went, were they able to make money, not go crazy, do good quality work they want their name on, speak with the customer after the job was completed, get the required permits and inspections without balking and interference from the customer...?
You have a budget and a contract?
Find an engineer or architect with TF experience and put their knowledge and license to use. This will protect you and the customer and all future users and occupants of the building.
Steve
