If you make the first two rows flat then you can have smaller figs in the front,it will also be lower, or have them kneeling. Make holes 1/2" apart that way you can see the figures in between the rows.. IF you make holes and pins in stead, then you can also make it like a diorama/playset. gray or silver will look more sci-fi ish also you wouldn't be able to see the dust that much.make some grid type floor like the figure cases have.maybe have it come with a cardboard background. Put holes on the bottom corners so you can keep making a step to the back if you have the space. or just make one row and the customer can connect them with included leg pins.