I'm trying to get a sense of scale...$120 would be 4x's the size/scope of Cleveland's Aquarium. Seems a substantial undertaking.

I would also think Detroit should leverage STEM in this project too. I've never been to the Detroit Science Center, maybe there's some relationship to leverage there...

the Greater Cleveland Aquarium opened in 2012 and cost approx $33 Million in a repurposed trolley powerhouse.

Milwaukee's Discovery World has an aquarium, but large music/technology exhibits and strong partnerships with local corporations [[Rockwell Automation, Kohl's, MillerCoors) - they're working on a $18 million expansion now