Willi will know the proper awnser but I think it maybe something to do with LV2 it has a grid texture you need to draw on the ground. Any way you may not have to do this as Willi is going to wright a new instructions as the turntable has changed.
Yes, Dave is right. This new grid texture will come with Layout Viewer 2.0. It makes placing of the turntable and the new bridges and walls much easier, as you can see the basic grid, RTR works with.