I am going to be doing another little people farm cake. The last time I used carved cake for the barn. This time I would like to use Rice Krispie Treats. Can I cover it in buttercream rather than fondant or will it fall off?Also, on my last one due to time constraints I piped on my fencing. This time I want to use MMF for the fencing. What is best way to adhere it to crusted buttercream?Thanks guys, as usual Cake Central rocks!!