To change the train wallbuy on Shadows of Evil, use this:
 

foreach(ent in GetEntArray("train_buyable_weapon", "script_noteworthy"))
    ent.zombie_weapon_upgrade = "s2_sten";

I've yet to figure out how to ...

Okay good to see there have indeed been random weapon power-ups publicly available for use, still some changes from natesmithzombies' version (download from KillJoy's megathread) ...

Now to figure out how to change the position of the weapon model pop-up...

Either relative movement:
[code=cpp]case "pistol_burst": //RK5
{
    ent.zombie_weapon_upgrade = "t5_o...

 

[img width=770 height=433]https://steamuserimages-a.akamaihd.net/ugc/2035114337776076708/5BFF3AA6B2C2D6F9ED6C89546B8DD9C9EA3179FD/?imw=5000&imh=5000&ima=fit&impolicy=Letterbox&imcolor=%23000000&letterbox=false[...

Trying to implement JBird632's Custom Claymores to replace Trip Mines needs some specific ordering: first add a new wallbuy .gsc-side while you still have location info then delete the previous ones both server- and client-side.
[code=cpp]//_zm_weapon...

As for the missing effects, try installing the BO3 tools additional assets and see if that fixes it. Thanks!

Haven't any luck doing that, neither did it help to make sure Campaign/Multiplayer was installe...