I've fixed all of the costs except the Attack Frigate -> Attack Corvette, since I don't know how LH works upgrades for ship chassises. Due to an error on my part, I found some more money by altering the Cluster Missile reloads. Instead of buying missiles individually, you purchase them by the reload.
So now I was able to make up the costs for the selling, and 7 Cluster Missile reloads besides.