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Thanks for your replies.
At this stage I'm only looking for any problems with the theory of it.
Would there be any problems in buying a mirror like that?
Apart from the increase in magnification over the 1000mm one I also want the increase in the critical focus distance (depth of field) to make focuing less critical.
The aim of trying to keep with prime focus method is to avoid the eyepiece + camera lens.
I reckon with the relatively short exposure exposure times for the moon (even at f30) the tracking would not have to be perfect.
I'll work on that side of it when (if?) it looks ok in theory!
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