some newbie Mod questions

[Chad]

But is something like what I describe even possible with the game engine?

For that matter, could you split 'units' allowed. Such that, it was 1k fighters, 1k mines, 1k sats, etc?

Any idea how one might go about this?

[Fyron]

There is no way to enforce a set limit on the number of a particular ship hull you can build.

Units count as generic cargo space. There is no way to change this.