Space maps

[TARevenger]

I finally got the TA War In Space Mod to work so i was thinking of creating a space map so here are my questions

1 How do/can I import a custom skybox?
2 Can I disable/make the water transparent so I can't see the water?

and if 3d objects are able to be added sometime in the near future making astroids so units can be built on them eg. mexs, stationary weapons, factories

thanks in advance.