Yeah, regarding the boxer swap, until someone actually gets it done and running, I'm not counting it. The purple V8 car you're talking about is the same one I was referring to, BTW. It belongs to a guy named Kevin Mackrell.
I managed to find the other one I was talking about. The track width and wheel base make it look really wonky. http://jdm-culture.com/adree-hamid-r32-in-disguised-s30-240z/
Also, while looking, I managed to find mention of a third AWD Z, posted on this very forum. This one actually looks really impressive. Fourth post, by OlderThanMe.