Thanks, BigEd.
Initially, it wasn't exactly clear to me in which part of the forum to post this stuff.
I think it belongs into "Emulation and Simulation" (like the SID dissection did),
but it also has some smell of "Programmable Logic" and "Hardware".
After (hopefully) getting a list of errors in those schematics from the community,
I'm able to proceed with the next step, what would be trying to translate some parts
of those schematics into 'TTL' by simplifying/compacting the one or other thing.
...But I think this would have to go into new thread which belongs into "Hardware", then.
Edit: new thread is
TTL VIC-II, some ideas