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Vacuforming is great if you have the equipment, but lacking that, try crash molding.
You will need to make a plug the shape of the canopy. Carve and sand from soft balsa or sculpt from Milliput and sand it smooth. Epoxy a holding stick of thin dowel to the bottom of the plug. Next you make 2 flat plates of lite ply or balsa with matching holes the general shape of the canopy base only a few mm bigger all around. Clamp a piece of clear sheet between then. Heat this over a stove burner or even a Bic lighter until the plastic is soft and then jam the plug down though the holes in the plates. This stretches the clear sheet and forms your canopy. You may have to make several to get the hang of it, but clear sheet is cheap.
HTH
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