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Line a 5x9 inch loaf pan with plastic wrap allowing a 4 inch overhang on all sides.
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In a small bowl stir together the wafers, butter and salt, press evenly into the bottom of the pan and freeze.
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In a double boiler, whisk together the egg yolks and sugar and cook, whisking until the sugar has dissolved, around 3 minutes. Slowly whisk in the citrus peel and juice over low heat until the mixture has thickened, around 10 to 12 minutes. Let cool for 10 minutes.
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Using an electric mixer, beat the cream until soft peaks form. Fold into the custard.
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Pour the filling over the crust. Fold the plastic wrap over the cake and freeze for at least 5 hours over overnight.
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To serve run a wet knife around the sides of the pan and invert onto a platter, discarding plastic wrap,
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Sprinkle with the coconut.