The way the data is structured: there are 7 Milestones to choose from for each Record, you will have multiple Milestones for each Record. Some could have none, others could have all 7. There are 4 main Milestones that need to be analyzed.
The goal of the stacked bar chart is to show a count of Records that have designated any of the 4 main Milestones on the bottom, and those that have not on the top.
Attached is my standard bar chart, the dimension is: