what kind of external fans do you need on those?
I can probably make a design for this PSU if I can have easy access to one and if the mating connector is easy to source.
Small custom batches are 10 boards.
Edit:
The PSU looked familiar, and after checking my spare parts stock, I know why.
I have 6 of the right angle mating connectors in hands.
FCI ref: 51761-10002410A A
Edit2:
I did a quick estimate of price for a batch of 10, you'll be roughly at 45$ each board with 8-12 PCI-E plugs and fan headers if needed (not PWM), design almost the same as this one:
http://imgur.com/a/4UWcr#7Delay ~2 weeks