I am the one making the snare drum for a grooms cake and it is the 29th only LITTLE OVER A WEEK AWAY. 
I am icing the cake in buttercreme and then putting fondant on the sides.
What is the best way to attach the fondant to the cake? It has all the things on the sides(don't know what there are called). It just seems to be really heavy.
I would love any suggestions.
I would guess royal icing since it dries hard.
Hope this helps.
I would use royal icing too... make a great "glue"
Would the royal stick to the buttercreme?
I have the cake in the freezer and I am thinking that I need to ice it on thursday so the fondant can dry and I can paint it on friday. The wedding is on sat. so will it be ok until then?
I must have lost my mind,b/c I am making the wedding cake,too and it has a cascade of fondant Calla Lillies. 
I would use piping gel. I would be concerned that royal would either 1)not set hard because of the BC or 2) break down because of the BC and lose its grip.
Piping gel is super sticky and sticks to both fondant and BC. Since it's early in the week, do a test run with some icing on a cake pan and leftover fondant. Then just leave it out and see what happens.
I made a drum for my nephew's birthday a few months ago and covered the sides in fondant. I iced with buttercream first and then applied the fondant before the bc had a chance to crust. It held up fine. I don't think you'll have anything to worry about. I wish I had a pic of mine to show. My digital camera's batteries were dead, so my mom took a picture with her 35mm, but hasn't developed them yet. It's not nearly as detailed as the one you're doing, but it turned out really cute. Good luck!
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