It would be nice if someone could take parts from Half-Life 1 and then put them into UDK.
Half-Life 1 textures in UDK
Half-Life 1 models in UDK
Half-Life 1 sounds in UDK
Half-Life 1 ai in UDK
Half-Life 1 maps in UDK
Half-Life 1 scenes in UDK
Half-Life 1 feel in UDK
+ BLAST PIT