I saw this on ebay about 4 or 5 days ago and almost posted it. 500$ is normal for a carbon fiber hood, so long as it has a decent name attached to it. Some such as Seibon are generally in the 600-700 range. However, I don't see who it is making this thing. That doesn't mean it's a bad thing, I'm just bringing that to everyone's attention. My past 2 CF Hoods on my 240 were VIS and AIT. The AIT was the better of the two, although it was 750.
Also to anyone considering CF for the Cube, you have to be meticulous about it's care, or it will turn to sh*t in a year or two. It's best for a car to be in a garage or under a cover, IMHO.
That being said.... this thing would look sex on a Steel Grey Box.