I am quite pleased with the 1000uF and supercap design, but they are to tall for the 8mm spacer between boards. I will have problems stacking other board on top as they risk shorting the boards. I can just about get one of the smaller super-caps, but no chance for the 1000uF capacitors.
The easiest solution is to just replace the spacer with an 11mm PCB spacer that is perfect for the connector anyway. I do however have an additional challenge with the heat-sink coming on botton. This Board is ok by itself, but I need to adjust the mechanics to be able to stack it.