On their downloads page[0] it looks like they have CAD files for the board and a BOM for the components. Probably wouldn't be too hard (or expensive) to have a few boards fabricated by PCBWay or OSHPark. I imagine the enclosure could be 3D printed, though I don't see any CAD files for that. And not sure how easy it'd be to source the other components, especially with all the component shortages these days. But I imagine it'd be possible to resurrect the project, and given that they're not in business anymore, they might be willing to share more information with anyone interested (like CAD files for the enclosure, or specifics on where they sourced the components).
The low-cost services don't seem able to directly eat Eagle-format files, so I could only price it on Eurocircuits [1] where it came out to €50+ which seems like a lot.
Strange for an open project to publish in a proprietary format.
It looks like the files are in an older, binary Eagle file format. Importing it into a newer version of Eagle and saving it in an XML format would be the first step. After that, KiCad might be able to open the files if you prefer an open-source tool. From that you could export Gerber files for the fabrication houses.
A board of that size with just two layers should be $2 + shipping for five boards with e.g. JLCPCB. A bit more if you want to go lead-free.
[0] https://sensebridge.net/projects/northpaw/northpaw-downloads...