I like this idea, but feel that we might need a few more parameters specified, otherwise as Autowiz noted, differing perimeter counts, or top and bottoms layers will significantly impact print time. A similar example would be the benchy #speedboatrace. I'd like to see a more useful print though, as benchies aren't very useful.

Iris box is a candidate, but it doesn't have particularly challenging cooling requirements, and is potentially problematic to scale with differing nozzle sizes (May need to scale wall thickness, but not the tolerances).