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They go into detail about making an internal vented locker for the tank. Not a way I would ever go but it's not all that uncommon in van builds. They even cover venting from altitude change and overfilling.
Again it's the concept of the site (parts list, and interactive features of...
Those little water heaters are not meant for a permanent install. I looked at them but shied way due to the lack of external vent for heat dispersal. They have to be used in an open space, and yeah a gas leak would be big fun.
I'll give these guys credit, they did a nice job with the info. The site is a little rough to surf (I'd have never seen these if not for catching a link in a random search for something). While it's a smaller vanlife application, much of what they present can be applied to larger builds...