Onua. I don't have any of those fancy Wolverine-claws, so I gave him wrenches.
Kopaka.
Gali. The helmet was the inspiration for this project.
Pohatu. I don't have any of the shorter minifigure legs, so he ended up taller than the others.
Lewa.
The Mata without their headgear. Lewa's axe attaches to his back.
And in the spirit of the story, I also built the Toa Kaita!
Akamai.
Wairuha.
Back view.
Knees! How exciting!
I'd love to see someone else take a whack at this idea. My selection of minifigure parts isn't particularly extensive, and an interpretation that used different pieces would be welcome.