I recently built an aluminum open air mining rig frame with a thick piece of Plexiglass with brass standoffs for mounting the motherboard.
Here you can see the Plexiglass I used in order to install the brass motherboard standoffs to ensure a proper motherboard mounting.
Reusing an old six card socket 1150 mining motherboard that is still going strong.
Everything seems to line up nicely
This can easily support 6 cards, I may add some fans in the rear of the rig eventually just to help increase the lifespan of the GPU fans.
The frame is held together with rivets
I will be using two 750 watt platinum power supplies each placed on the Plexiglass directly behind the motherboard.
Eth 30 mh/s 180 mh/s full rig
Power Limit 100
Graphics clock offset -200
Memory +900
Zcash 410-430 sols/s 2,500+ for full rig
Power Limit 100
Graphics clock offset +100
Memory +600
Ideally this would be best with a single 1200 watt or 1600 watt power supply with a 1200 watt power supply being ideal if you keep the power limit at 100 or below for all your cards and keeping power at the wall around 600+ watts.
Thanks for checking this out and feel free to ask questions or comment below.