If you highlight the entire ship You can Ctrl+C to copy it, You can open up your toolbar and use Ctrl+V to paste the design into your toolbar or you can just use Ctrl+V to paste whatever you have copied (It will become a highlighted outline).
What you can do however is copy the entire ship into the toolbar. Delete current built ship(*not copied version), place a single block, Paste copied version(Should just be an outline) You can then stretch it make it smaller make it fatter and the likes using all the keys like, A,S,Q and the likes. Im terrible at explaining things so I can clarify on anything that doesnt make sense.