Edit: I forgot to mention you have to set the camera (below "Background Model (Not fixed)") to SpacePlatform in order to see the stars. It is not necessary to use a dummy model, you could just duplicate an existing one and change its model. You may also use the trigger action "Set Background Model" in the Environment section to change skyboxes on the fly.
Click the image to see it whole.
Edit: I forgot to mention you have to set the camera (below "Background Model (Not fixed)") to SpacePlatform in order to see the stars. It is not necessary to use a dummy model, you could just duplicate an existing one and change its model. You may also use the trigger action "Set Background Model" in the Environment section to change skyboxes on the fly.
Download a Complete Preview Gallery of Skyboxes
PNG (36MB): Link Removed: http://www.mediafire.com/file/5ry6wwp5589xs59/SC2WoL Skyboxes.zip
Sample:
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That's pretty clever.