I know that this is several months, but I thought that I would add my answer for future generations.
I managed to do without additional plugins. If you set xAxes and yAxes to stacked: true at scale, you can create a horizontal graph with a horizontal layout.
scales: { xAxes: [{ stacked: true, }], yAxes: [{ stacked: true }] }
Here is a short pen to show how I did it. http://codepen.io/jamiecalder/pen/NrROeB
Bonus: includes a code for displaying values ββon a chart
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