We are getting close to locking down the hardware with every passing day! @satishgn just finished routing the latest version of the Electron sans the power supply, giving us the flexibility to test it with multiple options. Current design challenges include using buried/blind vias. While commonly used in the industry, the turnaround time for such prototype PCBs is about 5 times longer, making it a challenge to quickly iterate on designs.
We have also started to receive early sourcing feedback on parts at quantity. As a design engineer you always want the best and most optimal parts at your disposal. It gets a little interesting when you hear back that the leads times for them are at 16 weeks. Getting an early head start is alway a plus.