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Based on owning one (MN190) for several years, the tube is pretty much a standard 8" newt diameter (which is typically larger than 8" so it can house a 8" mirror), but with the focuser placed right at the front (with the secondary mounted directly on the corrector). The mirror is a standard 8" primary rtiding on a standard 8" newt mirror cell with standard newt adjustments, and I have had mine apart for cleaning. The corrector diameter is where the 190mm comes from. The corrector has a collar around it that fits over the front of the tube, this collar contains the position/lock adjustments for the corrector so it takes up some space; this is typical of Mak-Newts. I can't comment on Mak-Cass designs, they are different.
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