It works pretty well too with 2nd place overall in the National Championships Sportsman Class (nothing faster than a 12x1) last season. First year back racing after a 15 year break too.

I started on the design back in the early 90's but never progressed with it due to giving up racing and the materials not being available. Carbon fibre was a lot more flexible then. It also looked clumsy with 6-cells in it. I did build a prototype back then but never drove it. Got some pictures somewhere.

Despite it looking like a lot of car it still only weighs in at 830 grams with a PT fitted. If anyone's after a compact pivot ball design I can recommend the centre pivot off the BMI. Couldn't have built the car without them!