Just a suggestion to the OP, it not hard to setup and share a 5 node vagrant cluster on your laptop. Give concrete examples that people can run locally and test your assertions themselves. Once that foundation is laid, you can extrapolate to 10 nodes, 100 nodes, 1000 nodes.
Anyone that has deployed a cluster of that size knows that the article is missing a bunch of items, not limited to the following: - Overhead Instances (manager, service discorvery, loggging, etc.) - Configuration Management - Security Implications - Monitoring - Failure mitigation (its going to happen at that scale) - Update strategy at this scale
For those that are interested, one official doc and a good place to start when leaning how to deploy a large docker 1.12 cluster is this guide by docker.