Some movement, altitude and terrain rules for Starmada so you can use your Aeronef models:

Nefmada

I wrote them for AE but they should work with X or Nova. The only thing that might need modding is forests, just do the same thing those editions do with asteroid fields.

I'm thinking of ways to get LIs in here too. I think that would involve some ground movement and terrain rules, as well as special weapon abilities like Bomb (attacks in your hex and below you) and others that allow you to ignore the range restriction when firing at things at a different altitude.