You can cut down the drama and labor costs by 80% if you just stick with a built and boosted VQ, I think it would be an awesome swao though if you have the means to support a project of that size.
Some kid had his done over at lethal performance in GA, as for the an estimation on the figures it would take to do an endeavor like this..I wouldn't even know, if you go through the thread I'm sure you can some come up with your own estimation just by seeing what needs to be done.
The RB isn't too common of an engine swap for the Z33, the GM ls and Nissan vk swaps are bit more popular.
my-rb26-powered-350z-t465441.html
click that thread ^