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It appears from your drawings and text that there is one guide camera/scope mounted on the top plate and that this will be providing the guiding function for the two cameras mounted on the counter weight shaft. One thing to consider is the possibility of differential flexure between the guide camera and the imaging cameras in this configuration. You will very likely find that this design may not deliver quality data even with the relatively short focal lengths. I suspect very strongly that you will find trailed stars on longer exposures when imaging with the cameras on the counter weight shaft.
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