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Hi
Making or buying an equatorial platform for an existing commercial dobsonian is not a viable project. Principally because the azimuth bearing needs to be on a flat surface to make it reasonably stable. It is not designed to be an "RA" shaft as it has no longitudinal or side thrust support.
However it is quite possible to make a support for an existing dobsinian OTA that can allow it to operate as an equatorial mounted telescope. Doing this commercially however would not be a commercially viable project because of the wide variation in the available OTA's and a suitable "box" would cost as much to produce as a standard equatorial head of the type that are available.
Barry
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