When I was first brought onto the Shuttle project, I was asked to make an animation of the system that was currently being deployed to customers. This was a 7 inch system.
Later in my work with our Shuttle line, I was assigned to redesign the whole system with some new technology and everything we had learned with the 7 inch system. I visited with the machine shops we were going to use and talked to our field personal to make sure that it was cost effective and easy to use in the field. I then used the old drawings as a reference, but started the whole design from the ground up. When I was finished I made another animation.