I've been going through it, and it is indeed enormous amounts of code to understand, but .. he wasn't stupid. He left a lot of clues behind and documented things in a way that a careful follower might be able to pick up the pieces. I think he wanted that.
So anyway I'm going to keep trying to understand the Wurlde codebase and if anyone else wants to discuss it, lets do it. Maybe we should try to start a thread of "Understanding <Twilighte Game in Focus> sources..."
Want to talks about games you like, would like to see developed on the Oric, it's here.