Here's a couple of shots of the tank. I used the same method to find the shape for decking as Abufletcher does. I make a pattern out of card stock and cut and adjust it until I have a good fit. Then I import it into model Cad, and add the details. I print that drawing out as a mirror image, tape it to the back of my aluminum sheet, and punched the rivets with a piece of music wire, rounded on the end. Then I bend the parts and epoxy them to the sheeting.