Wimbleware was previously operated with C Stock, so line diagrams inside those units included that service but not the rest of the District (which used D stock). S7 stock includes diagrams for the whole of the District, Circle and H&C so presumably is common user between those three lines.
Correct. S7 stock, as has been stated many times, is interchangeable between all three lines and regularly gets rotated around Neasden, Ealing Common and Upminster depots. Trains outstabled may stay on certain services for a few days, but will eventually work their way back to a major depot for the bigger exams.
Operationally in terms of stations and trains, the District and the Circle & Hammersmith & City lines are two separate groups. For service control purposes the C&H is generally* amalgamated with the Met, although both the Met and District do have overlaps with each other's trains.
In C69/77 stock days, as stated above, the trains were based at Hammersmith for major exams and outstabled at places such as Parsons Green and Lillie Bridge. Although the trains could venture onto longer District services, they weren't generally scheduled to do so, thus only included maps for the Edgware Road to Wimbledon service.