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Just be careful with the NEWT tool as it calculates assuming visual use and an imaging Newt should have a larger secondary.
I agree with the warning below from Shriaz concerning the impact on the light cone of moving the mirror up (you would be throwing image light out of the front of the scope as it spills over the sides of the secondary).
I found when building my imaging newt that the NEWT calcultions were not useful for a fully illuminated imaging spot at the camera sensor and I went up in secondary size to accomodate that. I tested my optics on a jig before I fixed all the components in place and this insured that the imaging spot was exactly where it should be.
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