Hello,
It got mentioned about two-and-a-half years ago on this list, but the MNT Reform campaign has finally begun:
https://www.crowdsupply.com/mnt/reform
Of potential relevance to those following EOMA68-related efforts might be various resources that the MNT Reform effort has made available:
https://source.mntmn.com/MNT/reform
Things like the PCB layouts, microcontroller firmware and case designs are published, although people have previously noted that Autodesk Fusion isn't a particularly libre-friendly format for the case designs.
One could envisage adaptations of this for EOMA68-related purposes or something with similar objectives. Certainly, user-upgradeable functionality via an externally accessible PCMCIA-style slot (or similar, rather than the internal SO-DIMM slot) would surely be worthwhile exploring.
Paul