i can make asteroid bases for the other races if you want to.
here is your file, and it's ShipEdit 3 beta compatible as well and feel free to edit whatever you want if you dislike something.
ANd you can just delete the N-AB from the shiplist, it's not that hard though.
I think that if you delete it, it will randomly choose from the ones i made now, and that wouldn't be that bad, but in AB defense, you really should defend you race's own AB.
I'll try and i will notify you about the results.