Brad is currently manufacturing a Custom Twin Turbo kit for a VS V6....He is also doing a custom Turbo kit for a skyline, so it can definatley be done....
The best thing for you both to do would be to give him a call at the workshop, this way he can go through everything with you...At the moment, he is too busy to get on the net, so this would be the best way of contacting him.... (08) 8250 2233.
He is at the workshop well after 'normal' business hours, so if you have to call him once you finish work say around 6 -7 this would not be a problem!
If there are any further questions, please dont hesitate to send me a pm, and I can ask Brad for you and get back to you!
Cathryn