After a long time without access to a computer and internet, I have finally been able to get back onto creating Proving Grounds. There have been massive changes to NS2, so the mod has been re-coded from scratch. this is very much a work in progress, but today I am releasing a mappers kit. As the mod is not currently in a full working state, I wouldn't advise this be used for anything other than mapping. I hope to have a playable release out soon.
I have some of the basic movement in, double-Jump and dodge for example, so mappers can get an idea of the movement, although the code in use is far from final. If you have any questions, drop me a line.
Edit - It seems the upload is broken and I cannot upload the files. I will wait for this issue to be fixed, then upload the mapping release..