You will certainly not fit it all into the nominal spacing of 110mm. However, the Celestron site implies that the reducer will work from 50mm out to a spacing of 225mm, which is plenty.
http://www.celestron.com/c3/support3...articleid=2243
Understand your anxiety - no definitive data anywhere. If you still have options, maybe get the focuser/reducer and try it out with eyepieces to see what it does at various spacings. Also might consider the narrow OAG, look for a camera with small flange-focal plane distance and get a short draw tube for the focuser if possible - all will help you get closer to the nominal 110mm spacing if that turns out to be important.