Ok, first off, I found all your leaks (there were approximately 5 gaping holes) and sealed them.
Second, when you compile you're going to hit the max_patches, to sidestep this error compile using the -sparse command on rad.
Third, I'm not sure what the map is supposed to be, as I only made sure the compile would reach rad, but I can see a large amount of really bad things in terms of mapping techniques. There must be upwards of 500 separate brushes with different colors of light emitting textures. These and many other brushes are overlapping each other quite often, causing unecessary face splitting.
Fourth, that huge nulled box will have to remain until you clean up all those trigger_hurts. They are excessively large to the point of crossing through the void, and with how many individual brushes there are it is almost impossible to see where they should extend to, so I'll leave that up to you to fix.
On the same note as the brushes overlapping, those trigger_hurts overlap some of the walls as well, and with some of your walls you didn't fully connect each corner leaving some of the triggers exposed to void.
Finally, here's your fixed .map file, there is still more work required of you, such as cleaning up those trigger_hurt entities so you can remove that null box.
http://sites.google.com/site/nefariousparable/downloads/Splak_Race.map?attredirects=0