Place the first cake layer on a cake stand or serving plate.
Add about 4 generous scoops of whipped cream on top of the cake layer. Spread it gently using an offset spatula, bringing it slightly toward the edges and creating a shallow “well” in the center using a spoon to hold the mango curd.
Pour a thick ½ inch (or slightly more, depending on preference) layer of cold mango curd into the center. Spread it evenly so it sits neatly inside the cream border without spilling over the edges.
Carefully place the second cake layer on top. Gently press it down just enough to secure it.
Apply a thin crumb coat of cold whipped cream over the entire cake (top and sides). Chill the cake for about 30 minutes so the crumb coat firms up and the layers stabilize.
Once set, frost the entire cake with the remaining whipped cream. Use an offset spatula or bench scraper to smooth the sides and top for a clean finish.
Chill the cake again for at least 1 hour so the frosting fully sets and becomes firm enough for decorating.
Finish by piping whipped cream and spooning thick swirls of mango curd on top of the cake for a rich, glossy look. Just before serving, decorate with freshly cut mango pieces to keep them bright, juicy, and fresh-looking.
Make ahead: This cake can be prepared up to 3 days inadvance. Store it in an airtight container or under a cake cloche in therefrigerator to keep it fresh, moist, and stable.