A Wedding

I'm making a wedding cake this Saturday. I don't think they know about my Scout Eagle Court of Honor cake disaster or they wouldn't have asked me to make it.
Anyway, they like strawberry cake so I was testing out this recipe I found yesterday. The cake was quite good and the frosting even better. I'm not sure I can use the frosting because it's kind of thin and runny for decorating, but I think the cake will taste good with regular old white decorator's frosting if I decide do that.
Here's the recipe for the cake and the frosting. I will make this again, it was that good.

Strawberry Dream Cake

1 white cake mix
1 1/2 cups frozen sweetened strawberries, pureed
12 ounces cream cheese, softened
8 (1 oz) squares Bakers white chocolate
1 cup heavy whipping cream
1 (8oz) container cool whip, thawed
1/2 pint fresh sliced strawberries (optional)

Preheat oven to 350°. Grease 2 9-inch round cake pans.
Make cake per directions except substitute the 1 1/2 cups of strawberries for the water and add 1 extra egg. (My cake mix required egg whites, which I used and then added a whole egg), and 8 ounces of the cream cheese. Beat well and pour into the prepared pans.
Bake for 35 minutes or until golden brown. Let cake cool fully before frosting.
To make frosting, heat the heavy cream until just beginning to boil. Pour it over the white chocolate (chopped) and the remaining 4 ounces of cream cheese. Mix well and let cool. Once cool, fold in the cool whip. Frost cake and garnish with fresh strawberries.
I wonder if it would be better to chill the frosting before frosting the cake because when the put the frosted cake in the fridge, the frosting firmed up.