It looks very nice. It gets a little stuck loading some of the graphics on the custom design pages. When that happens, it won't let you navigate anywhere, but I assume that was due to the newness. On one of my tries, I made it through all the pages beautifully.
I really like that the ordering process is consolidated rather than paying Amazon and e-mailing Jeff.
A couple of suggestions:
On the color options page, I was bored long before I got to yellow. It might work out better if you have them all on one page, like the color graphics ones are, and people could enlarge the ones they want to see bigger.
You might want to include an explanation of the specifications for the included graphics, especially the sizes of the two Chucks, what the lowest resolution that will work is and the fact that people can give you a pretty good idea of what they are looking for and you'll make a gorgeous Chuck out of it.
Other than that, it looks great.