I have looked at the plumbing drawings at Zetec-cat and I was thinking if I could smplify the plumbing a bit. Here is what I came up with. Would this work?
Rescued attachment cooling-system-simp1.jpg

Come on guys, someone must have tried this and know if it'll do the job!

Almost there. The large thermo housing outlet is as per the diagram to the rad top hose. The two other mid size ones to join into the bottom hose between the rad and water pump. The expansion tank is teed into the offside mid size pipe on its route to the bottom hose connection. The small outlet to the exp tank small neck connector.