Your 7 inch wrist will have no problems pulling off any 42, or even 44mm ROO.
The thickness of the watch is more apparent when examined off the wrist, compared to when viewed on the wrist as the flesh of the wrist tend to obscure the caseback.
Unless you are specifically looking for it and are very familiar with the gen ROO profile, the thickness is not discernible by most people when worn on the wrist. Yes, the rep is about 2mm thicker as a fact. But this is observed only by guys in the hobby, like us, and not by the common man off the street.