Don't know if you noticed but it is not a genuine GNX. The car although nice, is by no means worth 40-50k. There are no genuine GNX parts on the car that I can see, which makes it a mediocre clone. Does not have the rear suspension, gauges, or any of the hard-to-find or rare parts. The mention of the front of the car being from 001 or 002 could not be true as, both of those cars are accounted for. The car is worth 10-15k in this market right now if the rims are not genuine, if the rims are actual GNX's then tack on another 5k. But I doubt that they are.
A that being said. It is definetly a nice well optioned GN.