I stayed in a hotel/condo room a few weeks ago where the master bathroom door was a teak two-piece sliding door like a closet door, but with big vertical bar handles on each and each piece slid back into the wall so it could be fully open, fully closed, or somewhere in between. It looked really cool because the doors didn't overlap or stack on each other at all. I thought that would be interesting to make, but wasn't sure what they did with the studs in the wall that it was sliding back into. I imagine it wasn't load-bearing so may have just been a stud-less fake wall of some sort. Or I guess if it was load-bearing you could build a fake wall out from the real wall that the doors would pass through, though you would lose a few inches of the room that way. But it looked pretty impressive.