[Bazooka_Joe]

[quote="Bean 2":f27cd]i think the models look alright but i was wondering how they can make a mod like that out of half life?[/quote:f27cd]

Because Valve distributed a more complex SDK for the game, which allowed more use of the source code. Hence, you have mods like Day of Defeat, Counter-strike, and others. This also allows for more fluid programming, such as cheats and server bots.