oh man, I need to. I just got my first energy weapons scientist with a greater than 0% bonus (23 years in) and I captured enough beam tech from the alien empires that I can now begin a complete overhaul of the armed forces.
By not blowing those shipyards, actually, I saved a lot of time and money-- some of them are pretty nice and the planet has plenty of population to slave in them. The redesigns will occur over the next year, and the construction will begin full swing once they hit candidate status.