Not eating, but cooking:
bacon roux, I might have a use for it tonight or tomorrow, and it's always a shame to waste bacon fat. I'll risk a cup of flour for a 50% chance I'll use the roux
http://www.tubecad.com/2004/blog0011.htm
The aikido is pretty similar, and you can get boards. You're not really going to save money building your own 6sn7 amp, because by the time you buy tubes, you're still out quite a bit of money.