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.
I don't know if you're still checking out this thread, but my girlfriend and I put it together.
Packaging is good, form factor is slick. The instructions were spot on and all the build materials seemed good. My biggest complaint is honestly the leather - its surprisingly lightweight and doesn't really give off the "premium" vibe. For instance I've got the apple leather case on my iphone6+ and it has a totally different feel despite being nearly the same thickness.
Just want to clarify I liked the kit and would recommend it but I figured I'd give you my whole honest opinion.