Lots more head scratching and measuring. I think I may have found a way to route the large 1.5" return line under the chassis back to the tank, rather than coming out of the engine cowling and round the main A frame. Unfortunately I think the main 2" suction line will have to go round the A frame, due to our hydraulics rep telling me not to use any elbows on suction lines! Also go the cooling system plumbed in and tidied up.
My next job is to get the pump pressure control circuit sorted out, I think I have found a good place for the proportional pressure relief valve, assuming that the coxa ram lines don't interfere.