G'day Stu,
Equatorial platforms are the go for getting a dob to track, lots of designs and plans on the net, plus a few commercial units.
No changes to your existing setup, just a platform for it to sit on.
Cloudy Nights has had lots of threads on EQ platforms, for example ...
http://www.cloudynights.com/ubbthrea...v=#Post4104338
My next project will probably be a platform for my 12" dob.
Cheers
Chris