I found a metal box on eBay that's a perfect fit for the 30m OpenBeacon xmtr board. It's box number 1166 from 'rfsupplier' and costs $7.74 out of China with shipping. It has a built-in circuit board slot that is a firm though not excessively tight fit. The box is 0.7 inches or so longer than the board, so a small circuit board shim can be used from the rear of the OpenBeacon board to the rear of the case. This will prevent the board from moving when cables are inserted or removed.
Prior to using this box, I was noticing some frequency drift and FSK keying waveform irregularities on my signal. These completely disappeared when I enclosed the board inside! A photo of my unit can be seen at this URL: www dot wa4kbd dot net/openbeacon.html
The metal front and rear panels of this box are rather thin and easy to drill / file. Love mine. Enjoy...
Here is the eBay link:http://www.ebay.com/itm/Aluminum-Projec ... 6rk%3D1%26