What is more important is the geometry of the plan rather than the total square footage.
Blocky rectangularand symmetrical homes tend to work with any Renaissance Italian or French style, and these can be downsized to very simple plans. Medieval castles tended to be assymetrical. Brissac was a Renaissance remodeling of an earlier turreted castle.
Plans with several bay windows and reentrant angles would work nice in a Gothic revival style.
I think we can include Craftsman style homes which were rectangular and then made more meandering by turn of the century architects such as McKim, Mead and White whose domestic architecture included very symmetrical and meandering plan layouts.
When building on tight lots it is preferred to hide garages in the rear via a side driveway or alley access as true period style homes rarely had bulky projecting wings forward of the main body unless these were symmetrically disposed and minor in massing relative the center area.
Since most of your experience has been in Europe and Turkey and most of the "Gentleman Homes or Estates" were/are rather large. What about period size? For example, a period dining room at Blenheim is certainly different than a period Banquet Hall, How do you properly size a "period room?"