This was 7 years back my friend. We built software prototype for measuring dimensions, classifying grain type and measuring color / brokenness. For hardware we had some initial designs where the objectives were - to easily put grains on a platform so they are separated from each other, easy cleaning and lighting uniformity. We had conceived some rotating or vibrating disks for grain separation. But the mechanical part of the hardware wasn't actually built. I have moved on. There is nostalgia around that was triggered by this thread, but nothing more at this point. Sorry to disappoint.