Here is a 3D model (kicad 3D view) of the Energy harvesting module.
It is based on a BQ25504 Energy Harvester (with MPPT and Battery management), pair with TPS63030 Buck/Boost Converter. It's perfboard/breadboard compatible.
There is also a 1V precision voltage reference.
You can adjust the parameters (Under & Over voltage protection, Output voltage...) by changing the value of some resistors.
I also made a breakout board for BCAP0350 E270 T13 Supercap (350F, 2,7V).
It's also perfboard/breadboard compatible, but you can use M3 Mounting Hole as terminals if you want (for high current).