For folks who want to try this route.. .check this out
http://smallwheelsbigsmile.blogspot.com/2010/10/guns-have-fallen-silent24th-oct-sunday.html -- The story of the monster guns and old changi village with the ride route
http://smallwheelsbigsmile.blogspot.com/2010/10/changi-guns-have-fallen-silent-ride.html -- Ride blog entry
http://mattchia.com/blog/?p=1268 -- Matt blog entry
http://www.flickr.com/photos/taiwoon/sets/72157625104434761/ -- hi res photos of the riders on the monster gun ride