Starfield experimenting... Zero distortion skybox texture. Two versions; with more and less of the dim stars.
First I tried with a 8192x4096 skybox texture, but the GPU or the engine didn't like that big a texture, so I had to resize it to only 4096x2048.
Here be two comparision shots. First with more stars and then with less stars. Tell me what you think.
However, I do not know how the UV mapping in the MediaVP standard skybox is done. These maps would probably work best with a simplest possible spherical UVmap - from a cylinder around the equator to the sphere (AFAIK that's the simplest way). Other kind of mapping would likely cause at least some kind of distortions.
Here are also the JPG versions of the textures, should you want to take a closer look at them.
What surprized me was how the new starfield affected the nebulae.