You have a general spec sheet but you don't lay out clearly what the differences between the three units are. I'm inferring that the MK1C has CAN bus support and others don't from the little picture you have for the MK1C. The MK1U is Arduino version? Can you be more specific? I'm interested in purchasing something but after watching the project for a couple months you still don't have a good information layout that properly defines your different products and why one would be preferable over the others.