It's great to see so many people these days rediscovering the chip and making these modernized designs. Disk I/O was such an unreliable pain back then. It's fantastic that most of these are designed for CF and SD storage now. Every time I run across a project like this on the internet, I eat it up. And thankfully, they are becoming more common.
If I had younger eyesight, and steadier hands, I'd be all over this project. (Anyone know of a company that sells something like this I can hook up to a dumb terminal? No FPGAs, or RPis, please.)
I met a woman just this past week who used to sell S-100 and Z80 machines at BusinessLand in Silicon Valley back when everything was just starting to percolate. We talked for hours about the experience and the people she met what the valley was like back in those days. (Like getting to try out an Alto in the 70's!)
The next time I run into her I'm going to encourage her to write all of that down and post it somewhere.
[Edit to add:]
If you want an excellent CP/M experience on a modern Mac, there's Tom Harte's emulator.† Unfortunately, I haven't been able to play the full Zork on it because Zork requires multiple disks, and I don't think it has a mechanism to switch virtual disks.