Rustica Hardware We also offer barn door kits. These doors look like they were custom made to match the rest of the house. You can hang just about any door to the hardware. The hardware is modern barn door with wooden wheels and a flat track. http://rusticahardware.com/barn-door-hardware/
Supa Doors Great look on the door selection by SAS, Kudos - it came out beautifully. Should one not opt for custom building the doors, there are several options on purchasing and hopefully at a more cost effective rate and still achieve that one of a kind look. We prefer using high quality MDF material, but the doors could be made from solid poplar for a paint grade application like this. In certain cases, they should come with a limited lifetime warranty, which can be important in the case of barn sliders than can have a tendency to bow/warp without the hinges assisting the door to remain straight. Best of luck!
For the entry to the Master Bath, I had a couple of possible ideas.
Use a sliding barn door to eliminate footpring of door.
Or simple the shared wall between the master bathroom and master bedroom be open on two sides. No doorway at all.
http://www.realslidinghardware.com/prop-flat-track-barn-door-hardware-kit/