Hi Dennis,
Thank you for trying for me.
It looks like I need to contact Mike Blazek for a copy of the plans and hope he may have a photo of the front (track side) at least, that he may be able to help me with. I have found a couple of very distant photos of the back of it in a borrowed copy of The RGS Story Vol 5, but nothing to show me the other side of it with the loading hopper and pipes etc.
Thanks again, I will stay optimistic that someone else may see this on the forum and come up with something.
Trevor