Mod.csv
// Bo3 Powerup models
xmodel,tim_bo3_nuke
xmodel,tim_bo3_max_ammo
xmodel,tim_bo3_2x
xmodel,tim_bo3_instakill
xmodel,tim_bo3_carpenter
xmodel,tim_bo3_firesale
xmodel,tim_bo3_perk_drop
xmodel,tim_bo3_widows_wine_drop
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how to install : 

1- open _zombiemode_powerups.gsc. with notepad++ ( The one in your mod/maps folder ) DON'T EDIT THE RAW FILE!!.
2- Go to line "48" and you will see something like this :
add_zombie_powerup( "nuke", 		"zombie_bomb",		&"ZOMBIE_POWERUP_NUKE", 			"misc/fx_zombie_mini_nuke" );
do you see where it says "zombie_bomb" ? this is the model name. so change this to your model that you want.
3- paste everything in the rar in "root/raw" and paste the images folder in your "MOD" folder
4- add the line above to your mod.csv & tick the new images.
5- build mod only.
6- Enjoy and don't forget to give credit to : Tim Smith.

- Tim.