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Cellfoam 88 from Midwest is lighter than balsa and tougher than other foam sheets.
It can be painted with many common paints (recomend testing on a scrap first, however.)
It can be cut with a good hobby knife, razor saw, ofr hot-wire setup.
Edges can be sanded to shape.
Use epoxy, "foam-safe" CA, household white glue, sorghum or 3M "Super 77" spray glues.