So I've been trying to include custom dynamic models into my map and I've managed to get a basketball working with a physics preset and I was quite happy  Though when you shoot at it, the ball bounces around like a person dribbling at it. My goal is to somehow make the ball deflate. This model, of course, was only a test. I was more focused upon using a custom car I exported a while back ago. I am trying to get the car to blow up, much like the stock ones. I have everything working except the spawn of the new destroyed model. Here's my model's keys and values in Radiant:

targetname: destr_murci
classname: dyn_model
type: destruct
physpreset: jeepride_boulder
health: 250
model: gg_murci
angles: 0 270 0
origin: -1464.4 -2240.6 1.5
destroyefx: fx_vehicle_explosion

I believed a script was needed to precache the destroyed model so I had help making this script from a friend who doesn't have the mod tools installed so he can't be too sure. I named the script _custommodels.gsc and placed it into the maps folder.

 main()
{
    precachemodel("gg_murci_nowin");
    
    thread testFunction();
    isDestroyed = false;
}




testFunction()
{
    //    Gets old model.
    oldModel = getEnt( "destr_murci", "targetname" );
    
    //    Check to see if the model is gone, not sure if this will even work. I can't test as i have no tools.
    if(oldModel == null)
        isDestroyed = true;
    else if(oldModel != null)
        isDestroyed = false;
    
    //    If the model is destroyed then spawn the model at the same position as the old one, not sure if the angles has to be set as well
    if(isDestroyed)
    {
        newModel = spawn( "script_model", oldModel.origin );
        newModel setModel( "gg_murci_nowin" );?
    }
}

I saved the script and ticked it inside the mod builder as well. In game, the car blew up, along with the beautiful FX that I assigned it, but after the dust clears, the car has simply vanished. The destroyed model is nowhere in sight. I assumed that the script needed to be called on somewhere within the My_Mapname.gsc file, but I'm not entirely sure. In an attempt to get the script called on, I added this to my fastfile mod.csv:

rawfile,maps\_custommodels.gsc
xmodel,gg_murci_nowin

Perhaps the script works but maybe I need to change the way I'm trying to execute it in Radiant? Any help would be greatly appreciated. This clueless ordeal has honestly paused my mapping to a huge degree and if I can't figure it out, I may just stop. I'd like for a level of reality in my map and not just boring stock or custom static models to just lie around. Thanks in advance to anyone who tries to help

oldModel setModel( "gg_murci_nowin" );

You should be able to change the model by just setting the old model to the new(destroyed) one like that.