First instal this plugin
http://forums.alliedmods.net/showthread.php?p=958925
I hope you know how to do it
Give the name of the model : turtle.mdl
Then go in models/player and there make a folder named turtle.
In models/player/turtle folder add turtle.mdl
Open player_models.ini and wryte :
; replace default skins
"gsg9" "turtle"
"sas" "turtle"
"gign" "turtle"
"urban" "turtle"
EDIT:players_models.ini must insert in cstrike/addons/amxmodx/configs
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