This question was asked by mail, so I'll insert it here.
Will there be a Unit Limit.
The answer to this is yes and no. Actually there will be no hardlimit, where the game says you are not allowed to build more than xx units.
But: For each ship you want to use actively (not hangar ones) you'll need a pilot and sufficient commando structure. So there will be the time, when one asteroid will not be able to maintain more than a set amount of ships. But this is because of logical factores, not because the game forces you too