To attract more tourists, the canton of Zurich commissioned

To attract more tourists, the canton of Zurich commissioned several life-size fiberglass cow statues with chiming bells, having them decorated in a uniform pattern by local artists, and set them up on the streets of the greater Zurich metropolitan area.
A. the canton of Zurich commissioned several life-size fiberglass cow statues with chiming bells, having them decorated in a uniform pattern by local artists, and
B. the canton of Zurich commissioned several life-size fiberglass cow statues with chiming bells, they were decorated in a uniform pattern by local artists, and then
C. the canton of Zurich commissioned several life-size fiberglass cow statues with chiming bells, had them decorated in a uniform pattern by local artists, and
D. several life-size fiberglass cow statues with chiming bells were commissioned by the canton of Zurich, decorated in a uniform pattern by local artists, and then
E. several life-size fiberglass cow statues with chiming bells, commissioned by the canton of Zurich, were decorated in a uniform pattern by local artists, and they


HI OA is

I just wanted confirmation on following.

The usage of had in the OA signifies that the statues were decorated by the local artists before they were put on they were put on the streets. Hence the usage of had justifies here, other being in the simple past tense.
Can somebody confirm the understanding?