AlliedModders - [Solved] [L4D2]How do you spawn a breakable wooden crate?

I use a pretty basic function to spawn in physics props within my plugins. It's not the most elegant method, but it's been enough for what I want up until now:

Code:

public Action:spawnpropangle(char item[64], char origin[128], char angle[128], float scale)



{

        new ent = CreateEntityByName("prop_physics_override");

        DispatchKeyValue(ent, "count", "1");

        DispatchKeyValue(ent, "collisions", "1");

        DispatchKeyValue(ent, "spawnflags", "3");

        DispatchKeyValue(ent, "origin", origin);

        DispatchKeyValue(ent, "angles", angle);

    DispatchKeyValue(ent, "model", item); 

        DispatchSpawn(ent);

        AcceptEntityInput(ent, "EnableMotion");

        SetEntPropFloat(ent, Prop_Send, "m_flModelScale", scale);

}

I now want to go a little further, and create a wooden box which will break into fragments based on the model (and gibs):

Code:

        PrecacheModel("models/props_junk/wood_crate002a.mdl", 1);

        PrecacheModel("models/props_junk/wood_crate001a_chunk01.mdl", 1);

        PrecacheModel("models/props_junk/wood_crate001a_chunk02.mdl", 1);

        PrecacheModel("models/props_junk/wood_crate001a_chunk03.mdl", 1);

        PrecacheModel("models/props_junk/wood_crate001a_chunk04.mdl", 1);

        PrecacheModel("models/props_junk/wood_crate001a_chunk05.mdl", 1);

I have no idea how to do this - I'm guessing using the brush entity func_breakable. It doesnt have to be perfect, I just want to be able to spawn regular breakable boxes.

edit: okay that was silly, i just added health keyvalue to the original function and it breaks into peices