Originally, my plan was to designate 1 page for EVERY coin ever made. Thats not really practical, and would cause most pages to be quite empty due to little info available. Take Antana Coins http://antanacoins.com/ ; would you want one full color page for each of them? Very innovative coins, but I simply don't have 10+ pages of material to write about them. Such a 'database' would be more appropriate in a web format; which is in the plans for my website www.coinfirm.org sometime in the future.
That said, I'll make every attempt to talk about every notable manufacturer & mass-produced coins. Small batches will certainly get attention as well. As for individual prototypes; it would be a case-by-case. point is; if it is interesting and relevant to the big picture, I believe it belongs in the book.
Each page of the catalogue section will likely have 1 or 2 coin 'profiles' (depending on how much I have to say) including photos, info about mintage, material, denomination, etc. and also a text portion which will include analysis or info about the things such as the art, its manufacturing process, any interesting anecdotes or observations relating to that coin in any way including history. It may also compare features to other coins and point out what other coins it seems to be inspired by from a design aspect. This isn't an exhaustive list, there's lots of things that could be written.
I'll also have individual pages for 'crypto mints'; established manufacturers who have created several coins. I will discuss the history, ideas, and inspiration of the manufacturer and compare them to others. I may include interesting facts, personality, the 'why', and other observations and thoughts.