Hey Skot! I came up with a similar idea at the start of the year and had PCBs manufactured, but only recently got around to putting them together.
Compared to your design, it's a complete breakout board that provides access to all pins in 0.1" format, as I thought better having too many broken out pins than too few.

Anyhow; you beat me to uploading the whole thing and testing it out. Good job; I read that it's already working quite well, so far.
However I'm wondering what you use to supply the 0.8V at probably around 10A that those 2 chips should be pulling. My next step would have been to design a buck converter circuit. Do you just use a lab bench power supply?

I'm definitely interested in collaborating to maybe make this into a compact USB miner with integrated FTDI chip and buck converter (I have a lot of unused slots in my GekkoScience USB hub.. ).
Otherwise, I can see a pod miner with more than 2 chips being interesting, too, maybe targeting 95W so a standard quiet CPU heatsink could be used.

Disclaimer: I'm a big fan of sidehack's work / GekkoScience and don't think such an open source project is going to compete with them. For one, their flagship Compac F is much more efficient and much faster, and also it's a ready-to-go product. These are PCB files that users have to get produced themselves and get to work soldering them, too.
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Hey n0nce!

that PCB looks good! it's cool to see more people doing this. Were you able to get the BM1387 pin pitch right?

For now I have just been using a cheapo adjustable power supply from Amazon. You're right, an onboard buck converter is the way to go. Unfortunately they're a little hard to come by these days with the chip shortage. I did a test with the MAX20499 (https://github.com/skot/MAX20499_breakout) but then I realized Maxim won't give the full datasheet to plebs. Still looking for a better part. the TPS51219 on the Newpac is completely out of stock.

I want to experiment with offloading everything that cgminer does (fetching work via stratum and rolling the extranonce) to an onboard microcontroller in a pod miner setup. I've started with an ESP32 so I can connect over WiFi too. (https://github.com/skot/bitaxe/tree/pro). Pair that all with a power supply suitable for solar and you could just litter your roof with these things

Is there a "standard" CPU heatsink with fan? I looked around at these but couldn't really come up with anything. It seems like the economies of scale with the whole PC water-cooling scene could be useful here.