If anyone is looking at this in the future, I've made a waterfall chart following this guide to make a stacked bar chart - Stacked Bar Chart in Perspective - Detailed Steps - #3 by Arnaud_Declerck and changing the bottom bar of the stack to have an opacity of 0. You will likely need to massage the data in your dataset a little to get everything lined up as it should be but that's just scripting a little arithmetic.