I don't know about this one.
1. the steering wheel is on the wrong side (if you're from the US) which may not be street legal here. The car may be a great deal, but it isn't worth getting pulled over all the time for it. You may have to retrofit the steering wheel to be on the left, and that could be expensive. Is it worth it?
2. The mixed rims is very suspect. Around here, if you see something like that, chances are, some of the rims came off of another car and were probably stolen.
3. Red flags go up when the seller is willing to unload a fairly new import car on you for $8k. To me, that screams "stolen car." An import like that would cost you way more than that anywhere else, like Crimson said, about $90k. For all you know, the buyer stole it from someone else, and is selling it to you cheap to get rid of the evidence. If you have the plates written down, check with the cops, they have a list of stolen car license plate numbers. That would also be a good time to find out if the steering wheel is legal the way it is.
4. Cars break. it's inevitible. It dosn't seem like a good idea to buy this thing when you can't even find parts for it easily. Before you deal, check with a nissan dealer to see if they can even work on a skyline. (an indie repair shop gets their parts from a nissan dealer if you bring them a nissan car, and respectively for any other make of car they do a similar thing, so it won't make a difference) so you may as well go to a dealer and get the info directly from them.
Even if a dealer can get the parts, they would have to import them at considerable cost to you. Are you sure it's worth it?
Personally, I would pass on this deal.