Presuming that the factory will deliver painted cases only three days later than non-painted cases, and the fact that everything seems hunky dory from these photos, I don't see the problem with letting them go ahead. They look pretty good to me, and they insist that everything fits. It won't affect the time it takes to start shipping completed units because Michael needs some time to solder those microscopic resistors onto the boards (seriously, how does a human being even do something that fiddly?!).