So glad to see Apple+CHM releasing the source code to LisaOS and Lisa Workshop on its 40th anniversary! https://computerhistory.org/press-releases/chm-makes-apple-lisa-source-code-available-to-the-public-as-a-part-of-its-art-of-code-series/
It's been nearly 9 years (!) since I sat down and tried to figure out how development for the Apple Lisa worked, using the LisaEm emulator, and documented my findings https://www.highcaffeinecontent.com/blog/20140527-Lisa-Pascal-Development-in-Lisa-Workshop