It's my design, but inspired from many many different sources.
The basic idea came from HelmPCB's project and Homebrew8088. "The 8088 Project Book" helped me start the layout but I soon outgrew it.
Ben Eater's video on building a CPU helped me understand various things, like how to implement an IO register, or make a POST-card with two 7-segment displays. I also re-used his idea of the data bus in the center.
Then there's Sergei Kiselev's SBC and BIOS. Absolutely fantastic source of information and knowledge! Because of him, or thanks to him, I ended up with a design that is much closer to the IBM PC than what I had in mind when I started the project.