Now, it looks as if a group of people are going to make a serious, gung-ho attempt at it. Below, you will find an ICQ chat I had with Fran ois today - it addresses some initial questions I had. Email Fran ois if you're a skilled 68K ASM programmer and you'd like to join the project. Hexalon why don't code in C with asm routines when neccesary.
C is easier to debug.
I'd like to see you code an entire ROM in assembler. This type of a project requires much more finesse than brute force. It's been done before, though. The 86 ROM was coded entirely in assembly. Yes, but by professional assembly coders who were paid for their work and told exactly what to do.