Coruscant background ships

[Clasa]

Remember in JK2 during the cutscene on Coruscant with Kyle, Jan, and Mon Mothma you could see all the ships zooming by in the back ground? Well i tried to all them to my level so when you look if there are little ships flying through the stars, but something odd happened. Usually in Q3 black on a texture means its transparent, but when I added in brushes in a box just inside the edges of the main skybox, and textured it with the two different ships textures from the kejim section of textures, what I ended up with was a black box for a sky with ships that werent moving. I then asumed I needed to find a shader version of the textures like when you try to make a sky with the texture instead of the shader, but there is none. This isn't vital for my level or anything but I thought it'd be neat , anyone have any ideas on how to make this work?

 

P.S. I noticed there are no shaders for the Yavin sky textures? whats up with that how are you peeps makin them work?