Humayun,
Everything you need is on this page.
http://www.scopestuff.com/ss_mrail.htm
Check the picture at the bottom of the page which shows a Camera sitting atop a Meade SCT using the mounting rail system. Very stable.
You can also purchase a set of rings that will fit onto the mounting rail to attach a guidescope instead of the camera. You need to order the appropriate rings to suit the guidescope you will be using.
BINTEL in Sydney may be able to provide you with a similar system although I couldn't see anything on their website.
CS-John B