Middle Atlantic seems like they have the biggest market in the U.S. for commercial A/V cabinets/racks. Dang, if I had seen that CH-2 box, especially at that price, I would have used that (but I'll get over it!)
Not A/V oriented, but the other U.S. rack company I like is
Chatsworth . They have the best rack screws!
Interesting on that SES outfit...one of their box options is for custom punch-outs (DB9s, power, etc.) Not sure if Middle Atlantic or that MA reseller offers that service, but that would have saved me a lot of time with a file!
[edit: never mind, I just saw the $60 setup charge for SES custom punching. OTOH, if 10-20 people wanted a rack-mount box, you could spread the cost across the group]