Thanks for post about his belated passing.
An incredibly smart fellow a skilled pilot and a kind gentleman, to my thinking he epitomised that generation of early glider pilot in Australia that built the clubs and often the gliders all from sheer work ethic and talent. Zolton's was also globally recognised for his design in the computer base systems that supported the airborne geo survey sensing systems. He was instrumental in introducing the DA42's into airborne geo survey and had management of that company at the time listened more intently to what he was politely advising them they would have had an exceptionally competitive platform, sadly they didn't.