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Ok - roof - air space a false roof. Can be sail cloth over battens - just something to keep the direct sun off.
Sides - paint with reflective solar paint (about 40% drop in radiation.
Then buy sheets of styrofoam from an outlet - they're very cheap - 1200 x 2400 x 12mm will cost about 7 dollars - go for about 15mm easy to work and Delta is about max for efficiency. Stick them to the inside and cover with 4mm ply (also less than 10 dollars a sheet.)
Stud adhesive is very efficient.
If you drill holes in the lower area and vent the top, make sure you put some serious rodent gaurd on it.
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