Rob_B: The 1672g race weight is body included, basically what the car weighs when it's put on the track.
The wishbones are AS9583 yup! They're the carbon B4 ones. I use them because they flex less, one of the advantages being that you won't have driveshafts popping out under heavy loads etc. You will need to drill a hole in the front of the arm and fix a ballstud on there to mount the roll-bar though.
Mark: Yeah, i've moved to SP now and loving the gear so far. It was the first time out with it at the weekend and it felt really good. Happy with it all