Thanks for the feedback guys.
I'll try halving the height of the terrain to see if that makes it more accessible to kbots and reduce some of the porcyness as well as put in more ramps. I'm also going to reduce the width of the raised left and right banks and cut down their metal amounts for the same reason.
If this doesn't work, I might have to leave it as a lesson learnt.
As for Povray, if anyone is interested I wrote up a wiki tutorial for generating textures some time ago here:
http://spring.clan-sy.com/wiki/Create_m ... ith_povray
The example I give in the wiki looks quite dull due to the base textures I used, not because of any failing of povray. Using better textures gives a better map (of course).
It takes me about 20 minutes to render the texture on a 2GHz dual core laptop. This is using the last stable Povray release which is limited to single processor - they have a beta which uses multiple cpus and which may run much faster.