There's two almost finished ideas in the thread: one by J4bberwock, and the other by myself. Take a look. I'm they could be undervolted to the hash point similar to the bitfury 400G rigs where each chip was doing between 1.5 - 2Ghash and they would not need heatsinks and could be mounted in a high density fashion.

Once one of the ideas bears its fruit I'd love to see something like this happen

Oh lord there's my next home project; wife's gunna hate me