I have to say, I do like this concept. Someone else already has a full body version of this drawn with the mask looking similar except that one has the bottom of the back cover unlike this one.(Tahu Minifigure - Brickonicle Concept Art - #37 by BioToa7) I actually have started modeling that Tahu minifig mask but I may try modeling this in the future
Edit
I didn’t realize it until a minute or so after uploading this post that you also created the other tahu minifig concept. I’m honestly excited for when you upload the minifig mask for Kopaka; he has been my favorite bionicle character for as long as I can remember