[crunch]

To change the light color-- with the light selected hit ctrl+k (I think that's it, it might just be 'k') Your color window will pop up. The color values will be shown in the lower right corner. Slide the crosshairs where you want for your color, and "add to custom colors". Now, without entering any values manually, your light will be that color.

I don't know what view you are trying to show with that (poor) skybox. Most of the time, if your skybox is leaking because of gaps, you'll get a huge
*********ERROR********** message, followed by "entity reached from outside".

Just for kicks, make a brush that covers your entire map about the size you want your sky. Enclose the whole map. Hollow out this brush, apply your sky tex to the inside, caulk sky on the outside. Don't miter or adjust vertices.
Then try your compile again. Let me know if that fixed the stall at 95%

Those little "error entity xx light leaked" shouldn't slow the compile like that.