Mango lamington layer cake

Name: Mango lamington layer cake
Cuisine: Australian
Ingredients: 85g cornflour; 125g plain flour; 85g self-raising flour; 10 eggs, at room temperature; 250g caster sugar; 65g unsalted butter, melted; 1 tbs vanilla extract; 2 ripe mangos, thinly sliced, plus extra to serve; 150g coconut flakes; 250g white chocolate, finely chopped; 1 cup (250ml) thickened cream; 400g unsalted butter, softened; 6 cups (720g) icing sugar mixture, sifted; 1/3 cup (80ml) milk; 2 tsp vanilla extract; 60g mango crisps (from Woolworths), ground (we used a spice grinder); Yellow and orange food colouring