Yeah, I reckon that's the ticket, thanks WeirdBits. Will have a look online and see what I can find.
I think looking nice is an ok justification. People like to see tubes, so even if it's not utilitarian it still adds something. In the end it will probably come down to how much time I have spare, and what design I come up with for the enclosure. Given Lawry's choice of Purgatory for the name I was thinking of maybe ripping some Durer engravings to print on the box, and a window will probably be inconvenient to navigate around.