How about the design below? I used to ask kncminer if there is dimension of heat sink to follow up. However, they have not given that so I have to design something like this to address their major fail on cooling.
Note that the rig requires mineral oil like vegetable oil, Johnson baby oil or some specfic as My design is for industial use. Can put PSu in oil. There are at least three companies in the States,proven valid.
What the design is? Ancient one, as your rig looks like 4ps Engine, I share in brief.
the design was designed for kncminer as I anger with their design. If debuts, then this may be horrible if the temperture is not at 4 degree C if you care the true operational cost.
Disclaimer : Although Intel, and some people like puget sys. , have truly proven the design like this as the system treat your rig as engine, basically valid. Need to be cautious.