03Assemble the cake: Let 2 pints ice cream soften at room temperature until spreadable, about 10 minutes. Coat a 9-inch springform pan with cooking spray and line the bottom and sides with plastic wrap, leaving a 2-inch overhang. Spread the softened ice cream in the prepared pan, then top evenly with the peach puree. Freeze until the puree is firm, about 45 minutes.04Let the remaining 2 pints ice cream soften, 10 minutes, then spread over the peach puree. Sprinkle with 1 cup of the pecan mixture and press it into the ice cream. Cut the pound cakes lengthwise into 1 1/2-inch-thick slices; arrange the slices in a single layer on top of the ice cream, trimming as needed. Cover with plastic wrap and freeze until firm, at least 6 hours or overnight.05Beat the heavy cream, confectioners' sugar and vanilla in a bowl with a mixer on medium speed until soft peaks form. Uncover the cake, then invert onto a plate; remove the springform ring and the remaining plastic wrap. Cover the top and sides with the whipped cream. Top with the reserved peaches and remaining pecan mixture. Freeze until firm, about 1 hour.