Retro game engine based on old id tech

This is interesting.

I have thought about looking through the source of old id tech engines but felt it was too complicated. Thankfully there's the Game Engine Black Book that has already gone through tjem and have distilled the concepts into easily understandable chapters. http://fabiensanglard.net/gebbdoom/

This project has reduced the codebase to the essentials so this may mean that it'll be relatively simpler tp understand its inner workings.

I hope to dive into this project's source in the future.