First, I have to say welcome to Hong Kong.
And I want to ask which "offical photo site" you were looking on??????
That spot is NOT an offical spot. It is a small hill.
I think 500mm
is "at lease".
Here attached a map of CLK.
I have marked four spots for you.
For 25L/25R/07R. You just need 100mm(777-300) to 200mm(737).
The bridge for 25L need around 250mm to 400mm.
For 07L, 300mm to 500mm.
The weather will become cooler from today (7Feb). (mainly Northern
wind) And RWY 25 was used in this afternoon due to Northwestern wind.
Hopeful this is using RWY 25. (25R/07L for landing passenger flights, (25L/07R) for landing cargo and all departures)
But if unfortunately there is using 07L. ..Touch wood.
You will need to go to the Hanger side by bus S52 from Tung Chung MTR bus terminus.