Wow this mod sounds awesome. Just read this thread from begining to end and watched it evolve from an awesome HL map, to a decent sounding HL mod, to an incredibly eerie sounding HL2 mod!
Using a 3d skybox for the perimetre wall. That would be terrifying. Thinking back to how the Citadel dominated C17 but now it's dwarfed out by a bloody solid wall around this City?! ARGH!!!