Excellent - I've had a great hour and a half practising in the NSX and managed a full 720 drift around one of the lanes before throttle control got the better of me!
You asked for other bits to add:
Upright marker boards on the skid pan making it easier to find the specific radius you want rather than having to try to read the track markings on the road. If they can be collision proof, all the better.
In the event of no marker boards, can we have the radius markings in the N, S E and W quadrants of the skidpan - makes it easier/faster to find your desired radius / lane.