1) rsrc>item>weapons
2a) rsrc>item>gear>armor>hybrid (variant Drake Red)
2b) rsrc>item>gear>helm>lizardhat>model-alt.dat (variant Drake-Red)
3)rsrc>world
In terms of three, all those have things used in the environment. Props uses things one would find in a stage (like for example barricades in FSC), dynamic uses items that animate in some way, environment can be used to create different ambients, skyboxes are used to create far away scene looks (such as the fire dome when in fire related zones or FSC), and finally tilesets are used to create actual stages piece by piece.