after seeing the work that went in to putting the rb26 in my car, which is considered a relatively easy swap, i can see this as being a hugely exspensive excercise and as some one mentioned a massive head F**k.
Im think its awesome to have something unique, but for the kinda money this is gonna cost i just cant see it being worth it. i dont think it would even drive that well. would still handle like a big heavy family car.
dont forget you can buy an xr6 turbo in the low 20's these days and it would be so much more modern.
If you decide to go through with it, best of luck and i'd still be keen to see it done.