I helped Steffan operate this a few times - I felt quite honoured to be asked. One of those was at Scaleforum though I can't remember which year it was at the moment. I think you have the plan and enough pictures to work it out now, but I have more if you'd like them.
I remember that the turntable only aligned properly one way, so you couldn't turn an engine. It was just used as a sector plate.
Dave