This is a simple design that can be adapted to fit you needs.
The holes are made for m3 screws, however you can drill them out to fit what ever size screws your are using.
For power I drilled a hole in the side to mount a bulkhead connector and soldered the fan wires to it.
I then just taped the wire down so they dont touch the blades.
The author marked this model as their own original creation.