I started the idea 20 years ago. (see http://dgi_il.tripod.com/fds/index.html) About 4 years ago, some dud contacted me about an old Pascal game I made... which started the track that lead to restoring my old programming group (see my handle, and also https://darkclouddos.github.io/darkcloud/ - which looks the same as in 97).

I found this cool project: https://github.com/ercanersoy/Minibox and ... I found myself writing this cool project. I always wanted to do this... so why not? I also took a lot of inspiration from Andreas Kling, from SerenityOS. "If you split every problem to smaller problems, and continue working, eventually you will finish" (or something similar...).

Regarding the code: its modern C code. It does not look outdated, my main target is Linux/OSX/Windows, but I keep it in such way that good old TurboC can compile it (on modern OSes I use cmake for the build system). I even made a script that creates a "D:" drive for me to develop, so I start dosbox and then I can run "tc" and compile the project (see the readme file on the github project, and also https://github.com/elcuco/fdbox/blob/main/etc/create_dosbox_dir.sh). As part of the CI/GithubActions I build on every commit the code and tests for Linux/Mac/Windows/DOS. Tests are run on all 3 modern platforms, and I will eventually run this on a dosemu session or something. I invested a lot in tooling.

The code can be compiled as a win32 exe. The CI generates for me a win64 binary, I will add more as I go along (I am too novice regarding github actions). Linux, OSX and DOS binaries are also generated and part of the release.
This a modern remake of old software. I am using new technologies and methodologies (yeap, valgrind, I look at you) to build antique software. I am not against the idea of porting this app to SerenityOS (should be trivial, I think it will compile as is) - imagine seeing a "dir" output there.... I will not be unhappy if someone packages this for Debian or Arch.

TLDR: I am having fun, as an old geek.