I built Makuta from Bionicle Journey to one with Lewa and Ekimu for scale. I used these instructions to build him docs.google.com/document/d/1Ai…
As you can see, Makuta is REALLY big, being over twice the height of a regular protector. The Ekimu in this picture is incomplete as Makuta used most if not all of my pieces and I didn't want to cannibalize more sets than necessary. The legs can't be moved very much, the arms can be moved a bit and i really love the retractable blades on his left one. The staff can spin a bit, so that's nice.
I haven't been able to pose him much, mostly because he often tilts backward due to how heavy he is and that I'm slightly scared to accidentally break him.
His mask, the Mask of Ultimate Power wasn't released, the one i have is in fact a 3d model i bought from shapeways, the Titan scale one to be precise, its a different material from normal bionicle masks and is a bit heavier, it tilts a bit when placed, you can also buy a smaller, villager scaled version that will fit on any figurines.
I also made some slight modifications, gave him spiky feets and changed the masks on his chain, from Tahu, Pohatu and Skull Grinder/Kulta to Umarak, Skull Grinder/Kulta and the Golden Skull spider mask. (basically masks of previous villains.)