No worries about hijacking - it's a threat about the need for OAG!
What is the total backfocus distance for your Edge? I could get the spacing from my FR to chip perfect using the OAG, filter wheel, camera and some spacers. According to this you get 105 mm with the 8" Edge FR:
http://www.celestron.com/browse-shop...-7x-edgehd-800
This is similar to the distance for my non-edge C8.
http://www.celestron.com/c3/support3...articleid=2243