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Hi Mike
There's no reason that you can't build for binos', a great idea, if you design your truss tube lengths so that the binoviewer comes to focus at near to the focusser in travel limit, then you still should be able to come to focus with single eyepieces simply by using an extension tube, albeit a long one, with the drawtube racked out. Used in cyclops mode the eyepiece shouldn't be much further out than the binoviewer eyepieces. You may need about an 100mm ext tube though.
Regards
Jeff
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