Dissolve gelatin powder in boiling water. Add cold water and vanilla extract. Pour 3/4 cup into a 9" pie pan. Chill until slightly thickened.
Insert lady fingers around sides of pan. Chill until set, but not firm, 2 hours. Chill remaining gelatin until very thick, 1 hour and 30 minutes; then whip until fluffy. Pour over gelatin in pan. Chill until firm, 5 hours. Then top with whipped topping and coconut.