Try to make a C65 Bible with 1500 pages (Hardware/Software examples with Userport, Expansionsport, ...) ... think big
I think that seperated manuals for these stuff would be better. E.g. a "BASIC programming guide" for the very beginners, an "assembler guide" and maybe a "technical manual" for the hardware people.
Who wants to hold an 1500 and more page book - besides some bodybuilder?