Here's a link to the class specifications. This spec covers how to build a vehicle for the Zukiworld Challenge. The spec for this year is unchanged from last year. One thing to note is that VORRA, the sanctioning body we're racing under, will be requiring HANS type devices for 2013 and are strongly encouraging them for this season.

http://www.zukiworld.com/forum/zukiworld-challenge/2011-zukiworld-challenge-class-rules-and-specifications/?action=dlattach;attach=19498