How to restore a Player Camera to Default?

I've made a camera script, so that when you click a part it sends a signal to client to change your camera to view a part. (Security Cameras Basically) And when you click again you're returned to your Avatar. However, when I do this the player model doesn't turn transparent in 1st person, and you can move your camera through walls. Advice is greatly appreciated!

-- This is in a LOCAL Script
local RepS = game:GetService("ReplicatedStorage")
local Remote = RepS.Remote
local CameraEvent = Remote.CEvent

local ViewingCharacter = true

local Player = game.Players.LocalPlayer
local Mouse = Player:GetMouse()

CameraEvent.OnClientEvent:connect(function(Camera)
	local Cam = workspace.CurrentCamera
	local Character = workspace[Player.Name]
	
	Cam.CameraSubject = Camera
	Cam.CameraType = Enum.CameraType.Custom
	ViewingCharacter = false
	
	local ActiveCamera = function()
		if ViewingCharacter then return end
		if not Character:FindFirstChild("Head") then return end
		Cam.CameraSubject = Character.Head
		Cam.CameraType = Enum.CameraType.Custom
		ViewingCharacter = true
	end
	
	Mouse.Button1Down:connect(ActiveCamera)
end)