@drabadue : vey nice job!
also this mobo could be interesting for workstation needs:
Fujitsu D3118-A12 GS 2 Mainboard NEU für Celsius R920 D3118
the main 16pin power connector is not an issueView attachment 6296 , and the 2 12pin connectors seem to be 6 12V+ and ground in line (except for the yellow/black cable I have never seen before..).
Could be a sister for the dell? or for another thread?
Lots of PCIe slots! It also looks like its more of a standard form factor. That would make it easier to get in a case. If you experiment with one, let me know what you find out.