The LiPo Charger comes with a JST cable, plug this and the cable removed from the battery into the LiPo Charger.

Place layer 3 on to layer 4, and then place layer 2, with the camera board, on top of that. The wire plugged into the Load socket on the charger runs inside a channel in layer 3. The camera's FFC fits through it's own cut-outs.

Place the Step-Up DC/DC Converter into the cut-out in the upper right corner. Measure and cut the wires from the Load connector on the Charger. We need to do this for both the Red & Black wires.

Solder the Red wire from the Load connector on the Charger to the VIN hole on the DC/DC Converter.

Solder a length of Red wire into the VOUT hole on the DC/DC Converter.

The DC/DC Converter uses a common ground (GND) so you will need to solder the Black wire from the Load connector on the Charger in the GND hole on the DC/DC Converter along with another length of Black wire.

To help keep things tidy I have soldered the wires from the Load connector on the Charger in to the holes on the DC/DC Converter from the top of the PCB, and the wires leading out from the DC/DC Converter through the holes from the underside of the PCB.