I say K.I.S.S. Basic guidelines could be: Max volume of 20 gallons + 10 gallons for a sump ( I think most people consider anything over 30 to 34 gallons isn't really a nano). Max hardware budget of $300? $400? Maybe $500? I bow to others on that. I plan on probably doing something in the 3 to 4 gallon range (so well within the size restriction) and I want it to come in below $300 so it really doesn't matter to me. Since livestock is so variable I agree that it is hard to agree on and police that budget so just have that open.
As I said, set some limits on max size and max spending and let people get creative within those limits.
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