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Hi Mokusatu,
A basic system is just the Binotron body. If you have an SCT or refractor with a decent back focus then that's all you need. A Newtonian and some refractors (and possibly the MCT if it has a fixed focal position) will need the OCS lens. Any system which will allow a camera to come to focus will probably be fine for the binoviewer and OCS.
An SCT will easily accommodate the filter slide, but some refractors and Newtonians may find it takes up too much room and won't allow the system to focus at the lowest power. (I don't have the filter slide on my own system, but I don't have the need as I live under very dark skies.)
If used on an SCT which is equatorially mounted then I'd recommend the SCT diagonal as it will securely clamp the system as it contorts into the strange angles the you find happening with equatorially mounted telescopes. On an Alt-Az this won't be necessary (but it wouldn't hurt).
If you have your own pair of matched eyepieces (I use the 24mm Panoptics) then you don't need the Denkmeier 21mm ones, but they are very nice eyepices if you don't already have a matched pair.
~ Steve
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