mini closet - Jack/King stud question
If you are tight on space left-right and can't afford the thickness of both jack &amp; king studs you may be able to use a header hanger instead:


They are available from Simpson Strong-Tie &amp; also Mitek in the USA at least.
Since the closet seems to be constructed in free space, it won't have any load-bearing function, so I don't think the lack of double studs is any problem from that point of view.