goto root/raw/maps located here:

C:\Program Files (x86)\Steam\SteamApps\common\Call of Duty World at War\raw\maps
and look for "_loadout.gsc" 


copy and past it to here:
C:\Program Files (x86)\Steam\SteamApps\common\Call of Duty World at War\mods\mapname


open the _loadout.gsc with either notepad or notepad++ and search for the following:
zombiemode

you will find these 2 lines:

set_player_viewmodel( "viewmodel_usa_marine_arms");
set_player_interactive_hands( "viewmodel_usa_marine_player");

find these 2 parts:

viewmodel_usa_marine_arms
and
viewmodel_usa_marine_player


open the mod.csv.txt found inside the folder for the viewhands

copy and past the model name (do not copy the xmodel,)

then in launcher navigate to the "mod builder tab"

at the very bottom of mod.csv copy the ALL of the text inside that 1 text file (so for example: xmodel,bo2_blar_blar_blar)




viewhands stats: 

ZM: COMPLETE
MP: COMPLETE
SP: COMPLETE