I love this project! Kudos to the author.

Some day, whenever I have the money to skunkworks this properly, I've wanted to create something like a modern spiritual successor to the Atari ST with enhanced creature comforts.

Something with a CPU based on POWER architecture (like microwatt) with a simplified multicore design (no hyperthreading or weird BIG+little core design - just straightforward homogeneous cores), a simple expansion interface of some kind, and an OS baked into ROM. Then I'd consider it to be built around a long term support model, with one design that can last decades, complete with schematics, chip design reference guide, and an open specification so it can be easily cloned as desired.

Especially now that Moore's Law and Dennard Scaling has slowed down considerably, it could be a fun platform to target for education or the demoscene, instead of spec chasing.