Update on the plans, my intention is still to use brushless drive, but I'm trying to find the highest torque and lowest RPM ones possible, and loading my machine up with magnets. The disc will remain, but naturally it'll not be quite as heavy as I first wanted. Maybe about 2.5/3 kg at a higher RPM, but I'm hopefully going to put plenty of magnets in the bottom of the machine, dependant on how heavy they are. The idea is that I'll make an entirely flip-proof machine, whether it works in the end is something else entirely, but hopefully it'll work!

Worth a shot in any case, would like to work on something a little different!