So I was rewatching the Mirimax Bionicle movies, and I noticed a few interesting design choices by Creative Capers.
The Turaga Body Structure is clearly based on the Bohrok Va
Compare the double jointed torso, and in some scenes if you look close enough, when the Turaga turn around, you can clearly make out a back piece resembling the "backpack" that holds the Krana on the original set. They cleverly covered these up with the robes. Side note, I think it's interesting how the Turaga of Mata Nui were depicted with simple cloth robes while Lhikan and Dume wore ones with intricate patterns. Truly reflects the contrast between the Mata Nui and Metru Nui settings
Also notice how the Rahi in Legends of Metru Nui appear to have been designed after the prototype sets
Compare this Kikanalo for example. The head design, body structure, and tail are almost identical
The leathery wings Nivawk gained in the movie also appear to be a take off of the wings of this prototype of the set seen in the "Making of" featurette on the DVD. The big change is that the movie wings are blue with yellow specks instead of black. The wing structure though definitely matches up