After making up wooden clamps and the use of duct tape, I made up stainless steel brackets for the heater pipes which go from the water pump at the driver's side across the car to the passenger's side.
I had a friend come over to TIG weld the brackets to the stainless pipes for me. I then used some pickling paste to clean the weld after.
This then enabled me to finally bolt up the cross brace to the chassis. I just have to install the 90 degree hoses and also the heater valve.