I really like the finish on the enclosure! I hope the box builder built in some tolerances for the woofer ID and OD so it fits properly. If so, I'd say everyone take note on who built the box and go from there.
The reason I say that is if people get the OD exactly right and then flush mount the driver they find out they can't remove the woofer from the enclosure without turning it upside down because you can't get any fingers/screw drivers/etc between the edge of the woofer and the flush portion. Is the box single sided all the way around, double sided, etc?
PS: The camera flash makes the surround look blue when it's actually grey, but you know that.