Is that tank green? If so, then I love it! I've been thinking about doing a deep burgandy frame with a dark green tank and pin stripes. I don't think it will look christmassy at all (I hope), and you've inspired me!
I also just spoke with Kevin from the 400four store. He was trying to think of me the other day when he said someone had done a 466cc kit with USD forks. My bike is coming out great, but I have to tell you a modern front end will not work with tank unless you get some custom triple trees to offset the forks. Modern triples like you are talking about are only offset about 30mm, and the forks are much wider. That creates an interference issue with the tank, unless you never plan on turning your handlebars. I got through it by denting the tank. Since you are already committed with this build and have your tank done, I really recommend just getting some trees made to fit your forks with adequate offset to clear the tank. You'll keep the same suspension geometry, so it shouldn't change the handling characteristics other than making it handle much better.
The 466 kit is complete, and worked out well. The head gasket wasn't perfect, but was close enough, and I doubt it will really cause any issue. It doesn't come into the cylinders more than a fraction of a millimeter, and my engine is not leaking oil. I also had Rick Denoon of DenoonSP bore out my carbs. With the stock induction and exhaust, it required a jetting increase to 85 or 90 mains without a change on the rest of the settings (although I haven't finished tuning to know for sure). It pulls much harder than stock too!
I have a guy I go to in San Francisco, who made wheel spacers to integrate the stock front wheel, and also found appropriate bearings to fit the Z1000 front axle to the stock wheel. Along with that, he turned a new steering stem and pressed it into the Z1000 lower triple tree. He charge under $400 for all of that, and it worked out great. He could do custom upper triples if you need too, and I highly recommend him if you are looking for a qualified machinist. His credentials are impressive, and has been in the industry since the 80s.
Keep it up, and PM me if you want my phone number to chat in more detail.
Camelman