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I would have thought stretching cloth over the structure would allow you to start layering fiberglass in much the same way curvy speaker enclosures are done in custom cars. Once you have a shell dismantle the dome for the inside and add foam bracing and fiberglass inside. Beef up where the opening is to be cut and then cut the opening.
I personally have no plans for an observatory yet either, but have thought about the type of thing myself with 3d printed intersections and lengths of alu rod.
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