Bring DOWN the console and enter “sv_cheats 1”.
cl_drawhud: removed
Wire frame models: mat_wireframe1
Only objects effected by physics are wireframe: vcollide_wireframe 1
Draw game triggers: showtriggers_toggle
Draw normal maps: mat_normalmaps 1
Draw surface materials: mat_normals 1
Turn off bump mapping: mat_fastnobump 0
impulse 200: removes weapon model from the screen