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Alex. Why 12"? If imaging is all it will be used for, then something smaller will certainly suffice. Depending on what your targets are anything from the humble 80mm up is feasible. I use the 10" newt on an EM200, and it is in a homebrew Carbon Fibre tube. It is as big as I would want to go right now. At the native 1250mm focal length, guiding/tracking/seeing/focus all are as grouchy as I can handle. The shorter/smaller the better I reckon. Hence the E130.
Lunar/planetary? Now thats a different kettle 'o fish.
You are thinking of mounting the camera at the prime focus? I suggest this is a good concept with something like the MX7C that Gerlad has for sale, or similar, as they are 2" OD, and actually about the same profile as the secondary on the 10" I have. You would have to provide a means of moving the whole camera fore and aft to focus, but Takahashi do it with their bigger Mewlons, so it is a great concept.
If it were me, I would be looking to do all this with an 8" or maybe a 10". Assuming DSO imaging is what you are considering.
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