An 8-foot model of a Star Wars Rebel Attack Cruiser made entirely of Lego blocks was being offered on eBay Wednesday, complete with a certificate of authenticity signed by George Lucas, the Lego Group said. Proceeds from the sale will benefit Habitat for Humanity's hurricane relief effort. According to the posting, the model includes "functional elements and secret treasures." Bidding, which opened at $2,500 on Wednesday, had risen to $6,100 by mid-morning today (Thursday), with nine more days left to go in the bidding.