I think it could be practical to be able to change the grid on the viewer to match a grid on the actual bed. I am thinking of lining up a grid on my bed to help place parts/apply glue, but the current grid in the viewer is too fine masked. If it was possible to add an image that would be very helpful, or even just being able to adjust the grid distance. 1cm is a bit too fine grained. Perhaps a possibility to make every n-th line a different color/thicher line? Then it would be possible to mark out say a 3cm or 5cm grid on both the screen and the actual bed.