Is there any way to make external shipyards unattackable, or put them back on a planet? With them being external, I have to double the number of ships I use for defense, and without a shipyard, if I'm ever under attack, I can't build ships because the shipyards are the first things they go for. I like being able to move, and link multiple planets to the shipyard, but having them immediately destroyed makes things really difficult!
Maybe I'm just a bad strategist, but I'd really like this to be possible!