Output's not a bad way of looking at it, I was drifting towards a more object-oriented classification but I can see output making sense. My only worry would be an ICly concern of some chucklefuck pulling the "every spaceship is a kinetic warhead bloo bloo" thing, but enh. I can see rotating excess strategic & non-strategic capability into $GJ; it'd keep the military-industrial complex at least a little happy though they may request some sort of quid-pro-quo if they keep producing (capitalists *eyeroll*). Population was pretty much the only metric that makes sense to me in terms of limits hard or soft, since we've got factions that have maybe a hundred people who've got entire air armies worth of strategic hardware. If nothing else that level of toy collecting needs to go, so forcing hoarders to scrap their stuff or rotate it into $GJ until they grow another thousand people or whatever makes sense to me.
Mr. Fnord interdimensional man of mystery
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"I. Drink. Your. NERDRAGE!"
Mr. Fnord interdimensional man of mystery
FenWiki - Your One-Stop Shop for Fenspace Information
"I. Drink. Your. NERDRAGE!"