i have to say that this base is working the best from all ive tried, i also modified it a little bit for th9
my X-bow i still in progress so i marked on the second pictures the changes to be made after is done. hope you like it and big thanks to Dan for posting the primary design.
--current base without the X-bow
http://i47.tinypic.com/2poeidy.png
--base when the x-bow is complete
--xbow to the cannon spot
--cannon to the tesla spot
--tesla to the xbow spot
--move clan castle, big bombs and other traps as you like it better
http://i46.tinypic.com/rbmq75.jpg