Simple and effective.
Though I have a long-standing quibble with such movement trays - when you take a figure out you are left with a 'glaring' spot of a different color/texture. Simple fix, a little paint (beyond the primer) - in the tutorial example just a dry brush of brown and green would do the trick. Maybe not 'artistic' but it reduces that 'glare' of the empty spot.
Looking forward to seeing your future tutorials.