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Hi Chris
Sounds like a great project, the Surplus Shed 127 x 1200 mm lens a fine lens, made a conventional scope with one of them a few months ago and for its' price it performs very well. In good seeing I've pushed it to 400X on the planets and double stars.
The design looks quite practical, can't see any real flaws in your design as long as everything is lined up to the optical axis' and the focuser is also centred to the "dob" altitude bearing. Have used black felt from Spotlight for anti reflective material on several scopes, once the felt is glued in place I've given it a light spray with flat black paint to help seal the fibres, seems to prevent any shedding.
Have fun with the project and please give progress reports.
Jeff
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