Alternatively, I could use most of the schematic into a miniature version of the 'shooting LEDs' installation, if he's more interested in that. I think I'd have to change the idea a bit so that I can make a self-contained object, instead of a long string of small PCBs.
Also, I found another hardware random number generator over here, which doesn't use the ALS-version of some 74-chip and runs on simple 12V DC. Saves on a lot of components and hassle (good luck finding that ALS-chip!).