It's an interesting historic conversion.
Two other photos
Intersting. Four concepts and three conversions all in one.
A Ford Model T converted by the coachbuilding firm, Columbia (maker of hearses, etc. for Ford chassis) to a luxury coupe and then converted again to a Cadillac chassis and then converted from internal combustion to electric batteries.
Perhaps the Cadillac chassis was required to accomodate the weight of the batteries?