Main frame of auditorium will be steel frame, a hull, which then has timber framing - layers of thin wood which can bend. This is covered with a metal mesh, then a layer of GRC (glass reinforced concrete) over the top - for flexbility to avoid cracks.
That is, to create solid GRC layers would be prohibitive wrt to cost of creating all the different molds needed.
The box exterior will be steel - galvanised, with main steel members and metal plates making up the exterior. The inner weather proof box will be double glazed thermal glass.
Roof, metal plate.
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