Retrofitting an entire interior?

Hi everyone,
been looking on this forum and found that retrofitting front seats is a matter of putting them on micra bases, but what about rear seats? assuming that they could physically fit. I really want leather in my k10 both front and rear seats so I am considering;

Reupholstering the seats, either myself or professionally
replacing with leathers if possible, they would be from another car.
fitting tailored leather covers.

Any info and advice greatly appreciated.
I've just reupholstered mine :) needle and thread and a fancy crossed blanket stitch :) nice and strong :)