Several hard tops are in existence:
Designed as a prototype but never went into full production. Photograph taken outside Mike Kimberley's office at Hethel.
Designed and produced by Simon Carrier. Increasing in popularity predominantly in the UK.
NTC Hard Top
NTC cars produced a hardtop in circa 2008:
Ken Read (Readit on LEC) adapted an MG hardtop:
From an advert in [www.milanuncios.com Mil Anuncios (May 2019)] for an Elan in Madrid:
Unknown blog picture probably based on Mk1 Mazda MX5 hardtop.