I had two gpu mining rigs. One intel based, one AMD based. Both had 6x EVGA 1070Ti's. Ran from M.2 sata drives and both from server psus with breakout boards and picos psu's. Both had the same Noiseblocker NB-Loop 120mm fans running at 100% and whisper quiet. All cabled managed to a fan hub one side. The frames I made myself to similar specs as the Parallel Miner ones they used to sell. Used thumbs screws for the gpus and each riser screwed to a supporting bracket which ran the length of the frame. Each gpu had custom sleeved cables from the server breakout board. all cables were cable tied and managed as best I could. I even fixed an aluminium momentary power switch, power led and HDD led to the frame just for a quick reference to see if they were running. I'll see if I can find any old pictures. I was a while ago as the intel was running a Z270 and the AMD was running X370.
Found a pic of one done and the other half ready for populating, cable management improved once the second rif was done:-
https://imgur.com/a/EVJuLJB