I just can't get to grips with the new Ship Designer. There doesn't seem to be any tech which improves miniturization significantly, all pre-designed ships seem already maxed out to capacity; perhaps this is why the Hard-points don't seem to work for me. Even when trying to design a vessel from scratch.
I haven't been able to delete a planetary sponsor from a shipyard; I wanted to give Mars a separate shipyard so that Mars could use some of its large population for Colonizers [and later Transports]. In the Early game I needed its production conjoined with Earth's production but after Terraforming and building farms the population just took off.