Wow, I do not know, but my guess is a Very Nice Custom, created from a Sedan Delivery in to a Pre-History Made......... Nomad. Very Cool no matter what the story is......
Fedman...a sedan delivery has rounded corners in the upper rear portion of the door.These doors are from a sedan.Indeed,it is a very well done job.
let me google that for you... http://gearheads.org/this-1953-chevrolet-nomad-makes-station-wagons-cool/ .