I've wrapped up the design for the bitaxeMax v2 and ordered PCBs, stencils and parts!
https://github.com/skot/bitaxe/tree/max_v2

highlights on this design;
- Single BM1397
- Onboard ESP32-S3
- Onboard high current, low voltage buck regulator. Digitally adjustable output via the ESP32
- On die BM1397 temperature sensor via the ESP32
- Fan speed control and monitoring via the ESP32
- Input power monitoring, via the ESP32 (optional)

The hope is that this is a reasonable hardware platform to develop the ESP-Miner firmware

thanks to n0nce, NebulaMiner, developeralgo, NotFuzzyWarm, sidehack and kano for all of the help!