Well, for anyone interested, I can take some pictures and measurements of the 3.5L in my sorento, so you have some ideas.
As for a swap kit, I've been wondering this myself. I've heard of this being done regularly over in Korea.
Like these crazy *** I4 swaps the guys down in Trinidad/Tobago are doing, the Nissan SR-20 (I think this is the name?) is constantly swapped down there, but we can't get them to send out a swap kit.
Keep the questions coming and I'll forward your interest.