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I completely agree with the 6-10 inch range being well suited to timber construction when it comes to imaging. Correction 6-12.5 (Rolf has proved that very well).
My 16 f4.5 is almost all steel with some aluminium and very heavy to maintain enough stiffness with the truss tube design and maintain focus across the sky. (70Kg approx, I haven't weight it since last modifications). When I started it 8 years ago there wasn't a mount that could hold its estimated weight which is why I went to the horse shoe mount to support it.
Optical performance of the mirror is important but not critical given most nights the sky just doesn't play nice. My GSO is quiet dirty at the moment and is still performing well, and I only bought it to work out the bugs of the mount and scope before I put something more expensive in its place and now considering leaving it there.
Justin
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