Why you cannot spawn some Left 4 Dead models in Garry's Mod

I know why you cannot spawn some props and doors in Garry’s Mod with some of the Left 4 Dead content, it’s because they lack data of props in the scripts/propdata.txt , here’s what must be added:

//=================================================================================
// DOORS
//=================================================================================
// Base damage modifiers for doors
// All doors have the same propdata - metal/wood/etc is handled in the door QC!
“Door.Standard”
{
“dmg.bullets” “1.0”
“dmg.club” “1.25”
“dmg.explosive” “1.5”
“health” “1000”
}

//=================================================================================
// METAL
//=================================================================================
“Metal.GasCan”
{
“base” “Metal.Small”
“dmg.bullets” “1.0”
“dmg.club” “0”
“dmg.explosive” “1.0”
“health” “20”
“explosion_type” “molotov”
}

"Metal.PropaneTank"
{
	"base" "Metal.GasCan"
	"explosion_type"	"grenade"
}

"Metal.OxygenTank"
{
	"base" "Metal.GasCan"
	"explosion_type"	"grenade"
	"explosive_damage"	"90"
	"explosive_radius"	"200"
	"explosion_delay"	"2"
	"explosion_buildup"	"OxygenTank.Whine"
}

// Large metal objects with health.
// i.e. ibeams, dumpsters, car bodies, refridgerators
"Metal.LargeHealth"
{
	"base"		"Metal.Base"
	"physicsmode"	"1"
	"health"		"200"
}

//=================================================================================
// PAPER
//=================================================================================
// Cardboard Boxes (non-breakable physics)
// i.e. fileboxes, boxes of paper
“Cardboard.physics”
{
“base” “Cardboard.Base”
“physicsmode” “3”
}

//=================================================================================
// PLASTIC
//=================================================================================
// Plastic blocks, less than 2 foot cubed
// i.e. plastic cups, plastic milk crates, phones
“Plastic.SmallClient”
{
“base” “Plastic.Base”
“physicsmode” “3”
}

End of list, Garry will add these lines to the correct places. I hope you add these in the next update Garry, stretch the web browser out and you’ll see what must exactly be added to the scripts/propdata.txt . If you already see these big things with plastic, paper, metal etc. just add these in: For example

// Large metal objects with health.
// i.e. ibeams, dumpsters, car bodies, refridgerators
“Metal.LargeHealth”
{
“base” “Metal.Base”
“physicsmode” “1”
“health” “200”
}