I will consider all the options, I may grab some cheap diag just for the hell of it, I expect there may be some light reduction associated with diags but if the concepts work (ie: no image spoils from the long tube) then a good quality diags for reduced light loss. I have thought about inserting a long erecting or barlow lense instead of a tube to maintain good image projection. I usually like to experiement anyway, part of my nature.
Still the chair sounds like a good idea although the car is looking a bit full with a transport mount for the 12" coll DOB. I may get the of-the-shelf chair any way.
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