Since I don't run two receivers I'll explain only the seperate battery thing.

Go here: http://www.geocities.com/traviscouch/hightech.html?
and on the right of Fiber Optic, you'll see "Connection" click on that and then just go down the page, because you have two ways of doing it, one is with the safest way "Fiber Optic servo extensions" and the other way at the bottom of the page.