Opel

Where have you found that old GT? A shame, to let that rot away on a field.  It was "little" man's ferrari once, cheap, only 90HP, technique completely opel standard from the Ascona sister, easy and cheap to maintain, low maintenance costs - only you had  to be slim and flexible enough to enter it.  Nothing for the fat kiddie of nowadays.

BTW Opel took up the  GT Idea with a (rarely sold) roadster decades later with a completely new model after 2006.  Funnily prices of both   are not very much apart  in the used car market  ...