Nice!
Very light carbon brake discs can be made inexpensively from F1 brake discs from ebay (I bought few discs with pads for £50 per disc). After cutting one disc in half, you get two discs with a maximum thickness of 9 mm. Only needed to make the inner part of the brake disc from magnesium. Four lightweight carbon brake pads can be made from one F1 pad.
That is by far the wildest racing adaption I have ever seen
How do you cut and grind the disks (Preferably without getting instant cancer).