Help with Model Transparency Command Script?

Hi..(Thanks for any help in advance) I am making a command script for my group and i already have most of the commands done but this one isnt working. when i say open this model with 4 parts becomes Visible. I already tried it with a part and it worked but i transferred the script to the model and now its not working. Output shows nothing but I think whats messing up something is when I call the model. I dont think its the chatted part or the admin part because it worked when it was a part and like ive said ive already made other commands. Here it is...

local Admins = {"iSvenDerp"}
P = script.Parent:GetChildren("Part","Part","Part","Part") 


function checkAuthority(name)
	for a,v in pairs(Admins) do
		if v == name then
			return true 
		end
	end
	return false
end




game.Players.PlayerAdded:connect(function(player)
    player.Chatted:connect(function(msg)
        if msg == "open" or msg == "Open" and checkAuthority(player.Name) then
            P.CanCollide = true
            P.Transparency = 0
        
        end
    end)
end)



game.Players.PlayerAdded:connect(function(player)
    player.Chatted:connect(function(msg)
        if msg == "close" or msg == "Close" and checkAuthority(player.Name) then
            P.CanCollide = false
            P.Transparency = 1 
        
        end
    end)
end)

There's two things wrong. First, your table P. With :GetChildren() it doesn't need any arguments meaning you should replace script.Parent:GetChildren("Part","Part","Part","Part") with script.Parent:GetChildren()

Second, it looks like you're trying to make the table transparent and Non-Collidable, not the actual parts. One way of fixing this would be to replace

P.CanCollide = true
P.Transparency = 0

with

for i, v in pairs (P) do--Loops through the children of `script.Parent`
	if v:IsA("BasePart") then--Makes sure that the object is a part
		v.CanCollide=true
		v.Transparency=0
	end
end

And do the same with

P.CanCollide = false
P.Transparency = 1