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Ben
A simple way around the problem would be to build a mock up tube with say for example 14" cardboard tube, which they sell for concrete column forming. That way you can put your whole assembly together , placing the camera and corrector with exactly the right position to leave you some in travel , then just move the primary in its cell up and down the tube to get focus. That will give you the spacings without any guess work before you drill holes in an expensive tube.
I would have thought a computer controlled focusser add on like Robofocuss would obviate the need for an expensive CF tube. There is a very good source for custom made aluminium telescope tubes in Sydney.
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