I found this which shows where the sensor is. It would seem that the auto focuser is around 3/4 -1 inch embedded, the tiny t-ring adapter is like around 1/2 inch, the nose piece is around 1.2 inches.....so all together the auto focus would be around 2.3 inches?
I cant seem to find exact distance of sensor but a common number i come across is 44mm? Thats a bit bigger distance around 1.7 inches which would mean the total is around 3-3.4inches, now it does seem like it would be a tad to far, the focuser would have to be all the way in. As reference my 32mm eyepiece is around 2.75inch long and focuser has about an inch left after full focus.
So as not to waste money it would seem going for canon 1000d has very high chance to not work and id be out of the money for nothing.