need opinions - new DWC setup

so here's my plan:

I want to use 5 gallon sterilite square buckets. I'm not planning on using net cups or hydroton, just wanted to put some neoprine in there and have the roots hanging into the water with air filter bubbling the water. where i'm having questions is I don't know how many plants we can put per bucket. we were hoping to be able to squeeze 16 per bucket ina tight setup for clones. and then move it up to 4 per bucket for flowering. I'd like some opinions - is this too much? we are planning on doing SOG type setup where the plants will be small (flowered under 12")
 
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