I've added heaps of panels to blood gulch, put the Turrets all over it and moved a few hills. I've also changed the warthog bullets to the Ghost bolts so it's looks cool when firing. Also some of the vertical panels are teleporters (Just look in Sparkedit if you wanna know where they are).
It takes a while to get around so I've added more Ghosts, but I've left everything else untouched for you to change. I did the collision model myself and it's not perfect..I know there are a few "holes" in places...you might call it a bug, I call it an extra challenge

If playing on system link you will DEFINITELY need extra fog to stop lag with all the rendering, but , again, i left it out of the patch so you can do what you like.
A big shout out here to Alpha112 for the panel model (from xorange's tutorial) as well as the usual thanks to Grenadiac for Sparkedit, CLuis for the Turrets and monoxidec for HMT.
Hope you like it