I would be very interested in 500 chip trays without the case. In 39mm size.I attached images of the case we made back in 2007 for an online poker site. It was an aluminum case with a removable 500 chip tray, with collapsable metal handles. We also did in 300 size. It was a really cool product. But actually I'd just like to do the tray now. Or do you all see benefit in having an aluminum case to carry it around in? Also, how do you come up with this 66.7mm recommendation?