Can anyone help me put a model iinside my viewport frame?

I have already made an animation with tweenservice for a single brick but I don't knowhow to go about it here's my. code for the single brick

local TweenService = game:GetService("TweenService")
 
local viewportFrame = Instance.new("ViewportFrame")
viewportFrame.Size = UDim2.new(0.3, 0, 0.4, 0)
viewportFrame.Position = UDim2.new(0, 15, 0, 15)
viewportFrame.BackgroundColor3 = Color3.new(0, 0, 0)
viewportFrame.BorderColor3 = Color3.new(0.6, 0.5, 0.4)
viewportFrame.BorderSizePixel = 2
viewportFrame.BackgroundTransparency = 0.25
viewportFrame.Parent = script.Parent
 
local part = Instance.new("Part")
part.Material = Enum.Material.Concrete
part.Color = Color3.new(0.25, 0.75, 1)
part.Position = Vector3.new(0, 0, 0)
part.Parent = viewportFrame
 
local viewportCamera = Instance.new("Camera")
viewportFrame.CurrentCamera = viewportCamera
viewportCamera.Parent = viewportFrame
 
viewportCamera.CFrame = CFrame.new(Vector3.new(0, 2, 12), part.Position)
 
wait(2)
local cameraGoal = {
	CFrame = CFrame.new(Vector3.new(0, 6, 4), part.Position)
}
local tweenInfo = TweenInfo.new(2, Enum.EasingStyle.Quad, Enum.EasingDirection.Out)
local tween = TweenService:Create(viewportCamera, tweenInfo, cameraGoal)
tween:Play()