These can be made in any of the cut and fold styles as shown by the variety of photos shown. The only problem will be choosing which style to do because they look amazing in all of them!
The majority of them are 450 numbered pages with the exception of I being 400, W and M being 550 numbered pages.
All are made central in 21cm, they will fit taller books easily but may need adjusting for shorter books.
To see how to do this take a look at this post Is book height important?