I think the best way to convert a dob would be to create a new Fork Equatorial rocker base for it with tube rings. Or a split ring equatorial rocker base design. Similar i guess to JMI's NGT and NTT Designs.
Fork
http://www.atmsite.org/contrib/Harbo....Eq.Mntng.html
Split ring example.
http://www.geocities.com/joe_pearson...ing_index.html
Or something a bit strange.. three axis rocker base I really like this idea.
http://www.c2optical.com/mount.htm