If we got a map for the post uprising called like gm_u_nexus or gm_unexus I think it would be better to like use NPCs like Rebels, Combine Soldiers/Elites, Striders and (possibly) Hunters. If we also got a map called gm_d_nexus or gm_dnexus it will probably fit if we're using like HL2: EP2 NPCs like hunters even though City 17 was probably destroyed by then. Or for the destroyed version just make it like grafittied, explosion marks and things fallen over and maybe fire and some lights out