I plan on making a layered sheet cake with a stabilized cream cheese filling. I want to use cream cheese buttercream icing. I plan on using candy clay flat animal figures around the vertical edges of the cake. Can I use candy clay on a cream cheese icing or will it melt? I also plan on placing a tractor carved from cake on top. Can I use straws instead of dowels placed under the tractor. The tractor will be made to look like an old tractor, it's not very heavy.