I started using skyboxing and light_environment, the maps looks much better than it's perivous versions, please dont trust teleporters on this map, they are completly evil, well some of them are, Enjoy the map!
(note : no major changes to gameplay other than a death pit far from reach at the roof, only soldier and demoman and maybe scout and engineer can reach it, but they will immediately die upon contact with the invisable death trigger on the roof, also 4th floor access has been shut, due to "maintenance", try to go there will result in instant death.)