"...I'm not going to hold my breath..."
The Shelby car company, from the Shelby Cobra fame, has produced some hydrogen vehicles also. I’m not sure about their storage system, but I do know that they built a hydrogen Shelby Cobra and a Hummer. These vehicles are ready for the consumer with $$$, so there is no need to hold your breath. But United Nuclear has the storage system that is hands down amazing.
Holtz
JeffersonRepublic.com
its how they store acetylene