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I think the comercial rings you are talking about are the Antares rings? I enquired about them last year, a few months after they were first advertised. The last time I checked they were still unavailable as they were having some sort of problem with the locking mechanism which stops the tube rotating. Tubes for my 8" were about AU$400. Something like this would be perfect but of course are expensive. Another company, Parallax, also make rotators which ARE available (from the US) but are more expensive, you might like to google them to get some ideas.
If you try the idea on CN, let me know how it goes.
One problem with rotating the tube will be that it will throw the balance out a little bit, particularly if you have heavy eyepieces (Pentax, Tele Vu etc.) so you may want to consider some way of balancing them too.
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