The Airways museum website -
Airways Museum / Civil Aviation Historical Society
has a listing of Aircraft Magazine articles. From that list:-
1958 March
Our First Ultra-Light - Stits Flut-r-Bug - to Fly this Month
1959 January
Building and flying the Druine D.31 Turbulent
1959 April
The Druine D.31 Turbulent - Amateur Built Machine
The following pertain
VH-ULA
Certification of Amateur Built Aircraft - Druine Turbulent VH-ULI
Perhaps sourcing the articles from a library might jog the memories Dick?