Wow Mike. Hadn't read the thread in a while (been building a 510 and general life getting in the way of my z). Good to see you are still at it, I've thought about selling mine quite a few times lately as I've been pushing it in and out of the shed to work on the 510. Sat down in it last week and remembered how much I liked it, I'll get back to it one day.
Keep at it, I'm sure track day will be a beautiful day.
P.s. I had the balls fall out of a cv before. Shit of a job getting them back in.