I built an RC2014 and I really like it. I'm using some of Dr. Scott M Baker's boards (WD37C65 floppy controller and 512k banked RAM/ROM) so I can run CP/M. I'd like to get things set up so I can build CP/M on the RC2014, but for now I'm just starting to learn the tools.
I have a Wyse-55 terminal acting as a display with some ACIA board modifications to allow hardware flow control so it doesn't get overrun. I also have a VFD that'll do 40x15 characters or so, which is narrow for a CP/M system, but I should be able to modify the few programs that'll really make a mess on a narrow screen.
2014RC Computerphile video: https://www.youtube.com/watch?v=lU2NKHJygD8