What are they doing with all these components?

We are a small welding shop, 1 of our customers brought us a CAD drawing of an aluminum frame they want build. While we work,the customer never leaves the drawings with us,they remain just watching us. The frame looks like a new style race car, but other components we are welding for him appear to be ballist tanks, a pelum chamber like used on hovercrafts (i own one) and the most difficult thing was something which looked like a giant hang glider. what ever it is, it's going to look cool. it also has 3 motor mounts 2 in the back 1 in the front. They deny every guess we make.