Okay, go to the link below.  This build is using a HP 1500 common slot PSU with an eBay heat sink screwed to the lid.  Two 80mm Delta fans in the back, plus a double-fan blade Delta to push air over the HP heat sink fins towards the front of the case (drilled a few holes on the outside of the case).  And you can see the Dynamat material lining parts of the case to help with noise/vibrations.  This was an L-4500 where you have to remove the fan cases and all that junk.  The EVGA FTW and FTW3 cards are a tad too tall for the 4U case if you want to put the lid on.  But you can fit EVGA 1080 Ti SC and SC2 models inside just fine.  An Aorous 1080 Ti Extreme will also fit with room for cabling and you can put the top back on.  Of course, smaller cards are less of an issue.  Get the SC or SC2 over the FTW EVGA models if you can.

I placed some non-conductive material underneath the breakout board you see connected to the HP psu.  The heat sink keeps the HP fan from spinning way up; I found that with a heat sink, the HP psu supplies are very quiet.

You can see a Lamptron 5-fan controller in one photo I place that on the inside of the case right below where you see it perched in one of the shots.  This controls the 3 Delta 120mm fans up front.  I use a fan Y-adapter cable + fan cable extenders to take the 2 80mm fans back to the Lamptron.  That left one connection for the double fanned Delta above the HP psu.  I use fan cable extenders to reach the Lamptron.

With this psu and breakout board, you need some 6 pin -> 8 pin adapters/splitters.  The 1070s draw 150 watts or less depending on what I am mining, so I don't feel that presents any issue.

I apologize in that the pictures I took today did not come out so I will come back with some photos of all the cabling in place.  You can get the tops on if you avoid the FTW/FTW3 cards.  Cooling is fine using the Delta fans.  I have the Lamptron turned to about the 1 o'clock position instead of the maximum which would be around 5 o'clock on the knob.  Currently, I have two stacked -- one directly on top of the other.  No issues so far.  What is counterintuitive is that the cooling works out as well as an open air frame with no more noise if you turn the fans down.

Pros: High partner acceptance factor; doesn't look all that much different from some of the stereo equipment that I had in the past.  Quiet.  Good temperatures.  Cuts down on the LED light show.

Cons:  First build is frustrating.  Costs more than open air rig.  Have to be creative when fitting a server PSU into these as they are designed for screwing in a typical computer ATX power supply.

https://imgur.com/a/OcJ64