Delprat has held over 20 one-man exhibitions in Sydney and has also shown in all Australian state capitals and London.

In 1967 he was appointed senior art master at Newington College and in 1970 he performed in the cast of the school’s production of The Tempest.

[citation needed] In 1993 Delprat applied to Mosman Council to build a driveway over an unmade road near Wyargine Reserve, to provide access to his property.

[9] Delprat's plans were approved in principle, but he encountered bureaucratic errors which had to be remedied by the local council.

[citation needed] After 11 years the Council finally rejected the application, whereupon, in a ceremony at Mosman Town Hall on 15 November 2004, the mayor, in full regalia, accepted Deplrat's declaration of the secession from Mosman of his property, styled the "Principality of Wy".

In 1994, he created the paintings and drawings of Elle Macpherson, Portia de Rossi and Kate Fisher for Sirens, another Lindsay-inspired film, directed by John Duigan, starring Sam Neill and Hugh Grant.