I have baked the layers of a wedding cake and am left wondering as to my best stacking approach. It is a fairly dense sweet potato cake with buttercream frosting and I am worried about it sinking into itself. All of the videos/articles I've seen online seem to be for cakes covered in fondant.
The bottom layer is a one foot square, middle layer is a nine inch square, and the top layer is a six inch square. Each layer is 4.5 inches tall.
___ _[ ]_ six inch square _[ ]_ nine inch square |___________| 12 inch square
I've heard I should use dowels to support each layer (some say solid wood, others recommend hollow plastic). Also, I've received conflicting advice about using bases between the tiers -- should I use cardboard, plastic, or dowels only? I am really quite confused.