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This PCB is simply a way to distribute power to a bunch of male 4 pin MTA connectors. you can optionally put an led and 5.6k resistor on the PCB to demonstrate you have power and it is properly oriented. The holes spacings match the spacings that Blacet Research® (excellent modules and great support) used in their FracRak® system.
There are no documents. Solder the standard MOTM style, 0.156 in spaced 4 pin MTA male connectors in the orientation shown. Use one connector to connect to your power supply. You will also need some standoffs and appropriate hardware.