Regarding the wheels up landing by REL or REK at SY, I was the Surface Movement Controller in Sydney Tower when this occurred - in 1961 or 1962. It happened much as described. The only "damage" was scratches on the underside of the engine cowls. When the fuss was over a crane went out on the grass area to raise the aircraft, the gear was successfully lowered and locked, the engines were started and the aircraft was taxied to the apron. I think the pilots name was George Martin?
A few years later I was a controller in Canberra when the same pilot in REK or REL diverted there at night following an engine failure after cloud seeding. He only just made it and when I spoke with him later he said it was far more frightening than the wheels up at SY.