Interesting and nostalgic stuff!
For my part, I wonder if the "chequerboard" part of the IGS/ CC approach isn't overly hyped. In a decade operating B747, L1011 and Airbus into Kai Tak, the the Chequerboard was merely a sideshow to proceedings.
The basis for this observation is a twofold relationship:
1. You tend to go where you look [Don't look at the C/Board!!]
2. You usually find it is nice to look where you are going.[Follow the visual cues to the runway]
Therefore, I found it more relevent to fly down the Loc and Glideslope until "visual" [not necessarily or usually the C/Board] and then follow my desired track over the ground:
If visual early, most found it easier to sidestep left, adjust rate of descent for the longer ground track and enjoy the benefits of intercepting the RWY 13 extended centreline earlier. [Nice in a typhoon!]. If visual at minima, you pretty much needed to follow the lead in lights - maybe all you could see! Tricky in the SW monsoon....
This is not meant as a treatise on how to fly the IGS,
such a worthy document would flow to many pages! Suffice to say, much time was spent at many a bar arguing the pros and cons.
Nor would I wish to denigrate the role played by the beloved chequerboard! It would be enlightening to hear the opinion from older hands, who may have found the C/board more relevent. For me, there were other features that I felt more important, eg the Magistracy and the "shed" on the Kowloon city sports oval - to name but a couple.