Rotating kitchen is on the books now. the slide out swing around idea I had at first has chances of Kinking the drawer pull but it was worked out.

Round of half round so it would be flat when closed is possible also

the above example would turn all at one time and no cupboard. So it would be flat on back side when traveling.
http://www.sivacracy.net/2006/05/a_kitc ... wkahs.html
except the dishwasher and other appliances