Mining was my first love (I have over 2,000 posts in the mining sub forums going back over two years).  My 40 GPU farm (watercooled I might add because I am crazy) gave me the revenue to start a Bitcoin related company. The waning of GPU mining and the demands of TC, LLC left me with little time for mining.  For the past couple months I have had too much spare time (banks, lawyers, governmental nonsense) but hopefully that will change in the next couple weeks.  

I believe that while HashFast may not be persuing this their modules are very interesting from an immersion cooling perspective.  Flourinert is expensive up to $300 per gallon but a more useful way to look at it is the fluid cost per GH/s.  If you have 400 GH/s spread across 25 boards that is a lot of fluid and it may costs you >$2 per GH/s to immerse it and that isn't going to work long term.  If you have 400 GH/s on a single chip the fluid cost per GH/s can be much much lower.  I won't know how low for sure until I can get em into a tank but I estimate something on the order of $0.10 to $0.20 per GH/s in fluid costs based on the size of HashFast boards and the possible spacing.