The walls would be easy enough but moulding the foam to the dome will be tricky using 20mm. Maybe a thinner size would be easier...12mm or less. Theres a company on South road near Edwardstown ,Southern Insulation..I think,I've done work for them before. They'll put you on the right track, good guys to talk to. Then ring a few others for the best price.
Another option is polyurethane sprayed on but that can be expensive, though its easy to apply.
Or maybe buy a boom box for the dome. lol
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