Cen has some pictures on their website.... PPman beat me to the conversion... it is very easy.. but I went a step up... I cuat a 3/16 piece of aluminum to fit the battery holder... then I cut it out in the center to fit the servo.. I tapped the holes.. and voila....

yeah, those are the parts that you will need dogman...

I have some more pictures..

http://www.geocities.com/aqwut/gst3.html