I got the idea from early energy experiments. They used Muons to catalyze fusion reactions. The Muon replaced the Electron in Hydrogen allowing atoms to get much closer.
This experiment does the same thing on a larger scale. I've replaced the electrons in carbon atoms with muons and made a Bucky tube. They decay. New Muons have to be generated as fast as old ones vanish.
If we can stabilize the Muons, we can make materials that will be far denser and more energy resistant than their Electron bound counterparts.
Like so many nifty ideas in physics, so simple in concept, so difficult in execution.