Yeah what you say about the lack of designed in seat belts makes sense to me I have previously built a Locost Clubman and the design requirements for seat belt anchorages are a bit more than just putting big washers on the inside of sheet metal. Personally I would be happy to leave her just as she came out form the factory without seat belts but my beautiful wife is very insistent that I fit them if I am going to carry either of our children in the car.