Before you convince everyone that all palms have tapering trunks get a good book on palms like Palms Throughout The World by David L. Jones. And you will find that many don't have much taper to the trunk. Some such as certain Phoenix palms actually get biger toward the top. I have palms in my yard that look much like the Vue palms. We don't know what palm imspired their model. And yes some palms are like vines no bigger than your finger, The trunks of these are used as rattan and are commonly 50 to 100 meters long. There is lots of room for good modelers in this area and I think all of us would like more kinds. Glenn in Puna, Hawaii