You already know what it looks like:
http://folk.uio.no/clund/nexuiz/HookRace_v1r1.pk3
The changes are mostly minor, but include:
1: Reducing the slope in front of the flags.
2: Using Hint and better Vis options to increase frame rates. I get twice the fps in some parts of this map.
3: Fixed the location info (I hope)
If you have the older version of the map on your server, please replace it with this upgrade.