I can see that you was doing different Colony Ships too!
But I can see a little problem with your solution: the AI will be unable to colonize until research the DS hull.
I did a test with one starting planet, and it was a problem for the Klingon. Also, the AI built several "Colony" ships with FG size, with only engines.
Honestly, still I like more what Atraikius did with the Orks, or myself with the Aquilaeian.