The above is something to think about. The only other concern with mineral oil is that if any components are cheap rubber it will slowly dissolve them. This was my main fear before I realized all the capacitors seem to be a metal case. It seems like just the USB and power wires might pose to be a problem.

As for circulation and heat dissipation, you literally put the electronics in a tank and have a pump moving the oil through a radiator. It's almost exactly like water cooling but if you have a leak it doesn't fry your shit.  There is like a 0.01% loss of oil if it's mostly contained. ie if it condenses on a hose or wire and drips down = loss. 

All this effort only concerns me with the hashrate changing so quickly. What will it be like in a year? Either way I have enjoyed the hell out of this thread, everything I got to contribute, and of course the various help from community members. Great job everyone who's been here.