As promised we had an attempt at making a film to record a snapshot of the whole meadow using a variety of cable car type devices to transport a small camera on video mode over the top of the meadow. The first used gravity to power the cable car, and the lack of control made it less than satisfactory. In fact at the end of the filming it smashed into the post at the end. The second was a very complex affair using some sort of robotic lego gizmo. Looked great, but it did not work at all, so no film. The final version, and the one I think worked best, is shown below.
Here is the meccano version:
I have just received a new improved meccano model so may have another crack later when I get a chance.