Weights going well, Im only 7.5kg in the pics. As Im planning on adding 4mm Ali around the sides and a little on the front, Im probably only going to use one of the hardox discs which means only around 1.8kg (or 2kg if you include the weight of the great big pulley) of disc weight. The ratio is exactly 1.8 to 1 off the gold which at a very rough estimate could give around 3800-4000rpm off the overvolted gold. Its certainly not going to be any kind of vortex but I hope the drive will make up for it, it could relly pack a punch driving full speed with the disc up and running... well... I hope