I'm glad you like the build. I see this is your first post so, welcome.
Two disadvantages worth mentioning about this option, however. The first is that rapiers are definitely ahead of shortswords. The second, and more important, is that you only have acces to the basic monk stances until level 18 (monk level 6) when you get both adept of forms and master of forms. So the benefit of staying centered is very minimal and I'm not sure that it outweighs the higher dps of rapier especially if you're investing in the full elf weapon line including the 3% doublestrike. For levels 18-20, though, staying centered might be better than using rapiers.