*Update*
I can easily do it to all ship hulls. I'm unsure if anyone else can but I want you guys to try.
Go into design. Click on new. Then click on one of the hulls. Then click on a hardpoint (those red circles you see on the ship) and where you clicked another ship will be put on it. Click on another hardpoint and it will do the same thing. Keep going if you want to.
Here's another pic, this time its a small hull.
Link
I have yet to make a ship with this bug, but like I already said it will probably crash or something.