before you get to the center to center connection, you might want to read through this thread http://www.aikiweb.com/forums/showthread.php?t=25155
the question here is, can you put the ground to any part of your body? if you can't, then i would not bother with the whole center to center thingy. by the way, there is a second part to the above question which is quite relevant as well, but won't ask it if the answer to the above question is "no".
thank you for the thread.