Which Sydney? The Hobart-class guided-missile destroyer The Adelaide-class guided missile frigate The Majestic-class light aircraft carrier The Leander-class light cruiser or The Chatham-class light cruiser
But as you noticed I draw either never-were warship designs which not left the drawing board or modifications to existing ships/designs.
Only like 3 ships survived the war (Sydney Aren't) And the longest one HMAS Hobart scrapped in 1962 and Getting drawings of British Missile Weapons is very hard It took make quite some time to find appropriate drawings for use for my BBG Vanguard!
Maybe I could try to draw your country's only CA design the Cockatoo Naval Yard Cruiser: [link]