An unusual but not unique 'door' design was incorporated in the Nova kit car.
Originally a British design originating in the '70's featuring a glassfibre shell to be mounted on a VW beetle pan and mechanicals, it was subsequently widely licensed and kits were produced under various names somewhere in the world well into the '90's.
This is an american version, where it was called the Sterling......
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Rarely seen these days, they were a not uncommon sight in the Kit Car heydays. Only a year or two ago one cropped up briefly parked a mile or so from where I live.