Yes, the W65C02S is a huge improvement over the original NMOS 6502. There are many differences, in several categories, and I list them at
http://wilsonminesco.com/NMOS-CMOSdif/ .
"How to make a 6502 computer" is what the
6502 primer is all about. I wrote it to answer questions and misconceptions that kept coming up on this forum. Although I published it seven years ago (after I let much of it collect dust for nearly ten years prior), I do frequently make improvements to it, which is why I would prefer that you link to it rather than just lift a lot of material out, so the reader will get the benefit of the latest edits.
No member here will have expertise (or even interest) in
all areas of small-computer design and construction. One of my own weaknesses here is video, just because my own uses of the small computers have had little need for it. Rather than one person trying to integrate all areas in one book, a very worthy project might be to make some kind of index of forum topics, organized better than just how the forum software shows then chronologically according to date of last post, and easier to use than a phpBB forum search. (There are many times that the search feature doesn't help me much because it will kick out words that it deems too common but are not common at all in other contexts, or it will kick out words that it deems too short even when they're extremely important.)
Over the years, I've seen newcomers with great enthusiasm wanting to share their newfound "knowledge" with the world, to benefit others, and yet they get certain things wrong—sometimes even rather basic things—and then others find their web pages and are misled.
Although the original 6502 came out over 40 years ago, technology continues to improve what can be done with the 65xx processors (for example with programmable logic, more-versatile support parts, better PCB capabilities at lower prices, etc.), software methods continue to improve, unexpected new ideas come out, etc.; so I'm not sure that trying to collect it and put it in a book is best, as if it were all settled and this is the final word. It still continues to develop.
There is also:
- the 6502.org wiki which very few people have been taking advantage of or contributing to
- the non-forum part of this website with a wealth of subsections like "Homebuilt Projects on the Web," "Hardware Mini-Projects," and "Books for the 6502 Fanatic"
- my own links page with 500 links. I purposely leave out links to pages I think are misleading; and since I have not been interested in games, you won't find much there about games either. Much of what is there is about 65xx history, software, and cool things you might not expect. And of course my 88 articles have many hyperlinks also to additional helps, which is something that works much better on a web page than in a paper book.