[retroencabulato]

I disagree. Standalone gerbers aren't terribly useful for hobbyists, and you'd have no luck opening an Allegro project even if they released that (which they wouldn't due to in-house component libraries containing supply leads etc.)

This remains an excellent reference design to build upon. The world of PCB design is more labor intensive, but this would be perfectly simple to reimplement using hobby-level PCB software.

[rcfox]

Gerbers aren't design files, they're another rendered output.