The annual Barrett-Jackson auction in Scottsdale, AZ is less than a month away, and car aficionados from around the country are already gearing up for the six-day collector car sell-a-thon. One of the vehicles up for grabs will be this custom widebody Mustang that we first told you about in August. At the time, this ponycar was a mere rendering, but since then Galpin has completed the Mustang and readied it for the auction in January. Funk Flex