I was thinking about having some of the board sets made up for this scope clock:
http://oscilloclock.com
Schematics/Eagle files and firmware here:
http://oscilloclock.com/download
From the looks of the board drawings it is about $200 for a set of three boards from OSH Park, so about $70 a set. There are three boards at 80mm x 100mm and one smaller board about 1/4 that.
I am interested in one set, a friend is interested in another. Anyone else want to try? CRTs are pretty common, it should work with most electrostatic CRTs. I know R5-D3 has some, I have an old 5" one myself.
-Jerry