It's not the most user-friendly design - I found myself start at the bottom of the page where the form was, and then scrolling up to the pictures/descriptions, and then back down to the form, and then back up again to the next section.
Thanks - this is absolutely true. We're working on a javascript configurator so customers can better visualize what they're building. And see it all without scrolling. :)
For those interested, we did an Instructables "launch" a couple weeks ago: http://www.instructables.com/id/Custom-Thin-Wallet-Kit/. Having great instructions for the kit was really important to us, so it seemed like a good fit. We got a very warm welcome and some incredibly useful feedback.