I know there's already a discussion about modifying the canonical size of the Great Spirit Robot, based on the proportions proposed by Christian Faber. However, I'd like to suggest an alternative approach: resizing the islands rather than the robot itself.
According to Greg Farshtey, the Great Spirit Robot is approximately 12,192 kilometers tall. It's also explicitly stated in the canon that the island of Mata Nui covers the Great Spirit Robot's face. Since the robot is clearly humanoid in structure, it's reasonable to apply standard humanoid proportions to correct this difference in scale.
In humanoid anatomy, the head (and by extension, the face) typically represents about one-eighth of the total body height. Applying this proportion to the Great Mind Robot, we obtain: 12,192 km × 1/8 = 1,524 km
According to this interpretation, the island of Mata Nui, which covers the robot's face, would be approximately 1,500 km long, not the much smaller canonical size, which seems inconsistent with the robot's established size.
Furthermore, Metru Nui is consistently depicted as being significantly smaller than Mata Nui and is described as being about one-seventh its length. Using the adjusted size above: 1,524 km ÷ 7 ≈ 218 km
This places Metru Nui's length at approximately 215–220 km, which better reflects its narrative role as a major but subordinate island, while maintaining proportional consistency with the Great Mind Robot's canonical height.
This approach preserves the established size of the robot, respects the narrative assertion that Mata Nui covers its face, and resolves the inconsistency of scale by adjusting auxiliary geographical measurements rather than altering a central canonical element.
In short, this would require a separate thread, but I simply wanted to share my proposal here. BTW these are my very first calcs.