IIRC there’s only like 54 years of natural gas supply at current consumption rate with all known deposits tapped. So the less use the better. Coal is supposed to be in the 300-400 year range.

Seems like there’s potential space in a lot of the undercarriage, or as flat packs at the base of the engine and trunk compartments.

There are some companies working on electric crate engines for conversion, I forget the names but they should be ready sometime soon

Ford has at least one now, I think VW does as well