This is good to see! I have been testing with some of the Pimoroni NVMe bases, but a major issue with those is that the unshielded cable completely blocks 2.4G

This is good to see! I have been testing with some of the Pimoroni NVMe bases, but a major issue with those is that the unshielded cable completely blocks 2.4GHz WiFi signals. Hopefully that's an artifact of the base sitting under the Pi (so the cable curves around the WiFi antenna) -- a HAT theoretically doesn't have the same issue. Though the question arises of how to use this HAT with the active cooling system... if we can get both an SSD and a fan on the same Pi (without sacrificing WiFi), that gets us to basically full blown computer performance!