Thanks
I had two mixed bags of lego technic on order from the bay of E. Various pins and axels and arms etc. And yesterday they arrived and in one of the bags was a red plate with hole exactly as you have described. So I spent most of the afternoon trying ideas till I had a simple mech working. I modified the back of the tomb I built to have a notch in it and the a slope going up and away to the right. This part fits in and the lid stays flat, so all I did was make a large L shaped arm that is pinned to it and goes out the wall to the dial on the outside and it works pretty well. It lifts the lid a bit as it tips it over and slides off and you can move it back. Its not as sophisticated as the Adventures in Transylvania mech seems to be as it does not just slide over. But it works. So what I will do now is wait till the instructions are available at the end of the year. And then see how they did it and order those parts to modify what I have done. It will work ok for display in the mean time and I can build the rest of the stuff I want. I have given up on trying to get the figure to raise out for now, it can wait till Nov / Dec and I can get the proper bits and guide.
Thanks for the help!