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Hi Dave
The biggest problem encountered in piggybacking a guide scope onto your imaging scope is flexing. Most piggybacking is done with an array of comercially available clamps and rings on a bar that is fitted to the supporting scope. This is probably the best that most people can get but if I was doing it I would custom make the mounting components to attach to the most rigid parts of both scopes and fasten them firmly over the longest possible baseline. Avoid attaching to the actual tube part of the scope.
The most important thing to have though is the best possible equatorial mount you can get and don't overload it. If the mount is not stable even the best scopes will give mediochre results. Wide angle photography is not so stringent but when you want arcsecond resolution absolute smoothness of tracking is imperative.
Barry
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