With nothing better to do I looked around E1M1
Facebook page:
https://www.facebook.com/NothingBetterTodoButQuake/
Source code:
https://github.com/weeeBox/quake-one-in-unity
What works at this point:
· Door
· Elevators
· Buttons
· Enemy AI (except shooting, causing damage and some navigation corner cases)
What doesn't work:
· Pretty much all the rest