You guys should post this up on my350z.com. There are a few people on that forum that have been contemplating the swap but they've been getting shut out by the majority of people who don't fully understand the advantages of an RB over a VQ.
Also, you're are still using the RB26 oil pain, right? I heard that you can lose some weight by using the RB25 oil pan instead. However, I'm pretty sure the RB26 oil pan is a much better unit, so I guess it's a sacrifice that could be made.
Did you guys do anything to the suspension geometry with the new mounting equipment/method?