While I could have built a couple more tanks for the dairy, the extreme low relief means that they won't fit. The solution was to cut the parts in half and put them together. Here they are with the fences propped up.
A bit of off white paint and they will look the part. It wasn't too difficult, just time consuming. I am beginning to think that similar treatment with silver fuel tanks, but not as tall, might be a good idea to give some height to the fuel depot.
Tomorrow night I will carry on with some more window painting.