Made by one person, in code.
Every template here comes out of a single engine, so a correction made once reaches every template, every device and every edition at the same moment.
Nothing here is drawn by hand in a design tool and exported. Each template is a specification — what pages it has, who it is for, which devices it ships to — and a program that draws them. That is why left-handed editions can be redrawn rather than mirrored, why nine device editions exist rather than one stretched file, and why a correction takes minutes instead of an afternoon of re-exporting.
The research is the other half of it. Before a template is drawn, the conventions of the work it is for get read properly: how a cut is called in a pit, which revision letters a drawing office skips, what the practice-room literature actually supports about repetition, what a citation needs in order to be found again. What survives that reading is printed. What varies by jurisdiction, edition or house style gets a blank box and a line saying why.
If you use one of these every day and something is wrong, that is worth more to me than a review. Tell me the device and the page.