I live in Pakistan where dowels are not available, straws is sigh of relief! Are the straws strong enough? Im doing a topsy turvy cake this Saturday and i was planning to buy some plastic tube sort of a thing to use as dowels. Also, how strong the cardborad underneath the 2nd tier should be? I was wondering if its heavy, it may make the cake sink even with the straws? Im sorry, my questions might sound stupid, but im new to this cake business and im liking it a lot!