Swapping ship picture

[Emperor's Child]

That will work, but you could omit the step using mounts (since they are looking for a certain hull size) and just make the new hull one ton larger or smaller than the other design with the same effect. Then you can directly associate the new design with the slightly larger or smaller hull with ease from the design creations file.

Thanks for the help. I was thinking along the lines of using hulls of the exact same size and could not noodle that one out.