It's just the map, I'd create custom weapons too, but for 1, I don't have any models for them and I can't model for shit and for 2, I have no idea how.
Essentially how I did it was took the BSP of Lockout, then opened it up in Sketchup, took out the unimportant crap and converted it to a file CryEngine can read, then used that model as a base and basically made it my 'own'.
When I finish the part I'm currently working on I'll do a quick walk around on the map and if I can be bothered, I might plug in the mic and do some kind of commentary explaining some aspects of it.