NocturnalGhost wrote:
The method used in the space scene in the game was to use "sky_black_nofog" as the sky name in the map properties, with a normal skybox (using tools/toolsskybox) around the playable area.

Then, make a 3d Skybox area elsewhere on the map, with a sky_camera in the middle, and the inside faces of this box textured with "skybox/finale_stars".

Bingo.