Anytime up to two weeks before serving, make crumbs from wafers in blended
or with rolling pin. Combine crumbs and melted butter, reserving 2/3 cup of
crumbs. Firmly press remaining crumbs over bottom and up sides of a 9-inch springform
Freeze until firm (15 minutes).
Remove from freezer and spread vanilla ice cream in an even layer. Sprinkle
with 1/3 cup crumbs.
Return to freezer until ice cream is firm.
Repeat layering ice cream, with chocolate used last, in the same manner,
omitting crumbs at the end.
Cover top with foil and freeze.
Early on serving day put serving plate in freezer to chill.
before serving, invert pan onto plate, release catch, and remove sides and bottom.
Garnish with coconut flakes.