I have a model magazine with many close ups of the actual prop. It was a great ship. I was always interested in it and it's great to see someone may help me out.
Did you ever see the Sci-Fi and Fantasy Magazine with the scratchbuilt Betty on the back cover?
That was a build by my friend Ian - he's the guy that made the 3ft spinner that I posted photos of a few months back...
It was fully lit plus the engines were motorised.
I'll see if I can find his reference for you - I think he even spoke to some people in Hunter-Gratzner when he was building it.