Hi Lacy,
You've got some great gear there for your front end conversion. I've wondered about the ZX-10R forks for a while now, the fork spacing was what I was trying to determine but I didn't want to just ask on a Kawasaki forum as it might have alerted the natives to a forthcoming drought of forks! 210mm is the same as the R1 so it is a simple conversion - 2mm spacers on each side for axle and rotors.
Your Marvic Penta is damn sexy, I don't think the 5mm spacing that it requires is too big a deal - one-piece spacers will help maintain rigidity and you'll of course just need longer rotor bolts.
BTW am I the only person who read your initial post properly? I like that idea of doing what Honda singularly failed to do, in updating the VFR regularly to ditch weight and increase performance as the technology advanced. They weren't racing it of course so the return on investment could never match the GSX-R, but had they done it they'd never have lost their 'tech king' crown and bikes like the Sprint and ST4 would never have gotten close to the VFR - let alone beat it in comparisons.
On the rear wheel lug nuts - I have a couple of sets of tuner lug nuts (you can just contact ebay sellers to ask them to sell you four and they will do so) but my concern is that they use an 'acorn' seat and the OEM Honda lug nuts use a 'ball' seat. Honda is the only manufacturer to use ball seats AFAIK, and I'm yet to find an aftermarket manufacturer who does ball seats. Acorns seem to work ok for the tuner (rice) crowd and a member or two here have also had no problems, I'm just not 100% sold. I guess it's just a matter of regular checks on tightness I suppose, just as long as there's no sudden catastrophic failure caused by the different seating stresses over time.
Speaking of catastrophic failure, the words "Marvic Penta" gave me a bit of a shiver; Robert Dunlop had a hell of a crash on an RC45 at IoM in 1994 or so because his Penta rear wheel failed, and there were quite a few other examples. However I understand that Marvic learned from that lesson and increased the wall thickness of the spokes to a more rational measurement.