That is pretty amazing! I managed to get four emulator instances running CP/M inside of Unreal Engine. Could have added more but I'd have needed to build a bigger spaceship.
Is your project inspired by 0x10c? The graphics look amazing. I ended up using Irrlicht which .. does not look amazing.. but it has support for dynamically loading arbitrary 3D models which was more important to me for now since I am focused on Lua scripting for it.
I added a physics engine and started working on a demo with a jet/ship thing controlled with a C64 assembler program but it had a lot of work left and I will have to go back to it after I get more basic stuff going.
Yes partially inspired by 0x10c, I used to post my updates on that subreddit a year or two back. Thank you for the compliment.
I integrated color VT100/ANSI support into the terminal emulator and had basic TCP/IP network working with a simple telnet+zmodem client as well. So you could log into BBS's on the Internet and download files to the CP/M systems:
Mine was really a prototype, since then I've been working on a 68000 based emulator and an OS for it which I might integrate back into UE4 day. The other issue I ran into was how to go about simulating the spaceflight part of it. Somebody gave me a pointer about that though earlier today so I might have to get back into it.
https://imgur.com/Cv8HGIz
Close up of disk drives and an instance running Wordstar:
https://i.imgur.com/rIY1he8.png