CK, you've done a great job with this mod but....
I think you've missed a minor balance issue, ship slots. The number of ship slots varies wildly from race to race. Take the frigate for example, the number of slots ranges from a low of 20 to a high of 44. Now granted, most ship designs don't use all of their slots (I did say it was a minor issue
) but it can be frustrating for a human player to have to change hull levels to design the exact same ship that fit everything on the same level with a different race.
A bit esoteric but, just a thought.