They're all carefully chosen. I fitted some techs and in some instance, whole civs around the best quality units available. I keep it all on spreadsheet otherwise I would get hopelessly lost, plus it's easier to examine and change things in a spreadsheet than a biq. All units except Vril and Zetans are already in the editor and working in game. Have to hunt down sounds for a few though. I have the Moglin as a roaming barbarian unit on Mars but I am now going to add him to the Zetans since I love the airdrop animation so much.