Here's my mod to the Protector of Fire.
Bionicle modified protector of fire
I have changed the lower arm bones to black and have added 3M bones as the upper arms, to match the animations, and I have added 4M bones instead of 3M bones for the legs.
I also changed how the cannon works, and here is how it is built:
Bionicle modified protector of fire
It folds up exactly the same as it does in the animation-to the side, not down.
Bionicle modified protector of fire
Not big mods, but enough to make the figure better. I also used the Tonfa design that rayskull came up with. I'm happy with this.
Sorry about bad quality, used my phone to take pictures