Masteries fit build perfectly. +1

Good job with the guide, i like those item core, for excepcion of the mejais, i dont find it a good core item for kennen, depends too much for the skill of the player.
Good job with those runes and masteries, i used that build before, but then i turned more aggresive and found more efficent builds, i think kennen doesnt need that defence points, and with some ammount of spell vamp, and rushing into rilays you will be ok. If you dont, a dorans shield will help you, i dont get that tyears ago, but try that, if you want.
Check my guide if you are interested.

re-made parts of this guide, but I thought I would bring it back =D

umm dude, you need to add more and this is very similar to Huge's build.

its not exactly the same, there are a few tweaks with my own personal taste, but they are similar

this is the exact same item build as http://www.mobafire.com/league-of-legends/build/kennen-hiiiyyahhhh-30652