I have the standard desk mount / wall mount chassis. I’d like to bring the USB port out to the chassis, but the knock-outs in the end are N connector sized, not USB. Does anyone have a suggested solution for this?
If I wanted to do that, I might be tempted to buy a new case with the cut out already there, but I also
own a Dremel Tool and I think I would probably cheap out and cut a hole with my Dremel. 
many of our distributors and MFM partners make custom cases with USB ports:
http://mum.mikrotik.com/gallery/v/HU11/IMG_7592.jpg.html
http://mum.mikrotik.com/gallery/v/HU11/IMG_7938.jpg.html
http://mum.mikrotik.com/gallery/v/HU11/IMG_7983.jpg.html
http://mum.mikrotik.com/gallery/v/HU11/IMG_7985.jpg.html
http://mum.mikrotik.com/gallery/v/CN11/_DSC4036.jpg.html