This is certainly going to be the largest and most challenging project I’ve ever worked on, but I’m going to begin designing a Carrier board for the Raspberry Pi CM4, I’m hoping it will be a drop-in replacement. Currently, the biggest challenge for me is having the capability for DP Alt Mode, Thunderbolt just will not happen.
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A random question, would a PineBook Pro work better? They seem to have more IO. Not sure if that’s a better starting point.
if you can source a thunderbolt 3 chip, you can connect it to the pcie3x1 lane… if you dont use it for the ssd.
This sounds like an awesome project.
Good luck 
Any updates on this?
I stumbled on the Pinebook Pro’s wiki:
https://wiki.pine64.org/wiki/Pinebook_Pro
Might be interesting to put a RockPi instead the Framework.