Ok, before the last two years of post were lost, I was experimenting on a Skybox, there one could attack planetside. I was able to port a EF2 set into BC...
**Update** 03/10/17
I've gotten a set Skybox, after chatting with Mario, about his old EarthFX mod. That pointed me in the right direction. I was able to fly my command ship over the Golden Gate bridge.
This is going to be an interesting mod, because there are better freeware human and alien city and planetscapes, I've downloaded. I'm going to make a short video, showing the Skybox in game, later on.