Problem with rotating model in viewport frame

[targetframed (target)]

im trying to continuously rotate my model in a viewport frame but it only rotates the primary part. i welded and anchored all my model together. i also set the primary part of the model too.

code:

function module.shopThumbnails()
	local p = game.Players.LocalPlayer
	local plrGUI = p.PlayerGui
	local shop_UI = plrGUI.shop_UI
	local shop_frame = shop_UI.shop_frame
	local caterpillars_folder = shop_frame:WaitForChild("caterpillars_folder")
	local caterpillar_head = game.ReplicatedStorage:WaitForChild("caterpillar_head")

	local caterpillar_heads = {}

	for _, caterpillar_vpf in pairs(caterpillars_folder:GetDescendants()) do
		if caterpillar_vpf:IsA("ViewportFrame") then
			local worldModel:WorldModel = caterpillar_vpf:FindFirstChild("WorldModel")
			local cam:Camera = Instance.new("Camera", caterpillar_vpf)
			caterpillar_vpf.CurrentCamera = cam
			local caterpillar_headClone = caterpillar_head:Clone()
			caterpillar_headClone.Name = "caterpillar_headClone"
			caterpillar_headClone.Parent = worldModel
			local caterpillarCF = CFrame.new(0,10,10) * CFrame.Angles(math.rad(-40),0,0)
			caterpillar_headClone:PivotTo(caterpillarCF)
			caterpillar_heads[caterpillar_vpf.Parent.Name] = caterpillar_headClone
		end
	end

	local accumulatedRotation = 0
	if connection == nil then
		print(caterpillar_heads)
		connection = rs.Heartbeat:Connect(function(dt)
			for _, caterpillar in pairs(caterpillar_heads) do
				if caterpillar:IsA("Model") then
					caterpillar.PrimaryPart.CFrame = caterpillar.PrimaryPart.CFrame * CFrame.Angles(0, dt, 0)
				end
			end
		end)
	end
end

[targetframed (target)]

nvm im stupid. only anchor the primary part