Note: Links to parts 2 and 3 didn't seem to exist anymore in that article. But they were easy to find just by changing the URL, so here they are:

Part 2: https://codetapper.com/c64/diary-of-a-game/lemmings/the-maki...

Part 3: https://codetapper.com/c64/diary-of-a-game/lemmings/the-maki...