DEADBEEF messaged me last night with a LUA script for GMod 9.0. I tried it this morning and was pretty amazed with it!
Once again let me emphasise that this is completely serverside. Clients don’t have to download anything. You could literally join a server and out of nowhere be in a completely different game like this.
I’d like to put this in 9.0 but I don’t know how we’d do it. I’m sure he’ll release it when 9.0 is out anyway.