The reason the hud is'nt showing is because the directory is typed in wrong you will have to do that yourself as i don't know what you want shown same with the sound playing it may be incorrect.
Heres a script that dose what you want but the second time the character comes to the end of the waypoint it will do the same as the first, "sound and hud" also to get the character to stop after the second time you will have to adjust the second timer length to what fits for that waypoint at the moment it stops 10secs after the waypoint is started the second time.
;Artificial Intelligence Script
;Header
desc = Follow Waypoints
;Triggers
:state=0:hudreset,hudx=50,hudy=80,hudimagefine=gamecore\huds\kttw_1.tga,hudname=message6,hudhide=1,hudmake=display
:waypointstate=0:animate=2,waypointstart
:waypointstate=3:animate=2,waypointnext
:waypointstate=4:animate=2,waypointrandom
:waypointstate=5:animate=1,state=1
:state=1:timerstart,hudshow=message6,sound=audiobank\smash\glass.wav,state=2
:state=2,timergreater=1000:sound=audiobank\M3\RollUpDoorOpen.wav,state=3
:state=3,timergreater=6000:hudfadeout=message6,waypointreverse,state=4
:state=4:timerstart,state=5
:state=5,timergreater=10000:waypointstop
;End of Script
Heres a script that is a bit of an experiment it means the hud and sound will not show the second time but i have no clue if it will work as im away from my FPSC computer for the last week
;Artificial Intelligence Script
;Header
desc = Follow Waypoints
;Triggers
:state=0:hudreset,hudx=50,hudy=80,hudimagefine=gamecore\huds\kttw_1.tga,hudname=message6,hudhide=1,hudmake=display
:state=0:waypointstate=0:animate=2,waypointstart
:state=0:waypointstate=3:animate=2,waypointnext
:state=0:waypointstate=4:animate=2,waypointrandom
:state=0:waypointstate=5:animate=1,state=1
:state=1:timerstart,hudshow=message6,sound=audiobank\smash\glass.wav,state=2
:state=2,timergreater=1000:sound=audiobank\M3\RollUpDoorOpen.wav,state=3
:state=3,timergreater=6000:hudfadeout=message6,waypointreverse,state=4
:state=4:waypointstate=0:animate=2,waypointstart
:state=4:waypointstate=3:animate=2,waypointnext
:state=4:waypointstate=4:animate=2,waypointrandom
:state=4:waypointstate=5:animate=1,waypointstop
;End of Script