Hi,
At the end of last year, the Sky at Night magazine had some articles describing how to build an equatorial platform for a dobsonian, to allow you to track targets across the sky due to the earth's rotation. However, I found the articles too brief as a set of instructions to build from.
Anyway, I've now built it (with a little extra help from Mark Parrish, the extremely helpful SaN designer). Once I'd figured things out, I was able to adapt the design to the Skywatcher 200P. I've tested it tracking the sun, and to my amazement it actually works pretty well too!
To help anyone else thinking of building it, I've chronicled the details in the attached file. It should save you quite a few hours and mistakes, hopefully.
Cheers,
Julian
Building the Sky At Night Equatorial Platform.pdf