So i was looking through my old pc parts bin looking for Power Supplies I could use for 4x Boards and a Miniplane when i found this:

Good News: 40A on 5v
(Potential) Bad News: old style 20pin ATX connector.
Can we get confirmation that 20 pin can be used in the 24 pin slot or not for the drillbit miniplane? I know you can do this in some circumstances, bit since one of the missing pins is 5v, would this cause issues since the drillbit boards rely on 5v power?
I was looking at the photos of the boards and the missing 5V and Ground might put a strain on the 5V lines from the psu but should still be possible. However You should be able to use the 4 pin Molex connectors on each board and then the ATX connector on the miniplane for power control.