Something I discovered recently, and I'm using it for my Ring Stinger clone project.
I've found a really nice enclosure, courtesy of a gentleman in the UK (I believe). It's a larger than the recommended Hammond model, so it will adequately handle the Phase II. I took the liberty of taking some pictures, along with the two Phase II boards laying inside, so everyone can get an idea of the scale;
The external dimensions are; 8.74" X 5.75" X 2.17" (222 X 146 X 55 mm).
I found it at Newark, it's made by MULTICOMP . The Newark P/N is 55T2820 ($23.31) for the plain aluminium, 55T2821 ($25.08) for the black, and 55T2822 ($25.08) for grey. The MULTICOMP P/N's are; G124MF (plain), G124MFBK (black), and G124MFLG (grey). The "F" in all the P/N's stands for "Flange". For a non-flanged box, omit the "F".
I don't think you'll find an enclosure this roomy at this price in the Hammond line. Especially considering that this enclosure is also watertight, the cover comes with a rubber o-ring that seals the works.
Although the UK suppliers, Rapid and Farnell, carry the same model without the flanged sides, Newark only has this model with the flanges. So, you could cut them off quite easily with a disc grinder, cut-off saw, etc. Or, use them as I have done here, to give it a bit of an "industrial/rack mount" look. The flanges are already drilled, at 3.5" centers. The handles come from Home Hardware, with... well look at that!, 3.5" centers!