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As to cost I built one from scrap entirely..old chip heaters cut down for a truss dob style, poles from a caravan annex, old form ply that had been used as such, but just the nuts and bolts and fibre glass and resin just kept adding up, cutting the rings and just sanding them..seems simple and it is but it takes so dam long... and so even though it was junk the cost of the hardware to put it together was unbelievable...I had a mirror and a secondary but they had to be "silvered" and that was not cheap... buy one built and enjoy it.
alex
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