That's really impressive what you can do with CouchCMS.
From what I can see, you've successfully managed some pretty complex tasks with CouchCMS
and even integrated a shop system into CouchCMS - I think you really did a great job there!
The gallery pics are a bit slow in loading for my taste, but maybe this was just a temporary thing with the server.
A few ID and class names are unsemantic, but that's some petty criticism, I know
The AUTO UNION TUNING logo on the company nameplate (with the green gear as O in UNION) as shown in the Store Lauch News would also be great as a website logo IMHO, but I could imagine your client didn't choose it for legal reasons.
I like the look and feel of the site as well as its general accessibility.
Even keyboard navigation is working well.
Another plus point: very good validator results, too (the exception being some bits of paypal code, but that's not your fault
BTW, the Wheels pages, among others, are really classy looking!
Thumbs up for a really great job!