I'll conceade on the opinion that the toa hagah and the Mangai should be metru based because I seem to be in the minority of such an opinion. Even tho the set forms of the toa hagah we got are their canon apperances.
However as stated previously I still believe and will stick to the opinion that too intricate or too custom 500+ piece toa mocs will deviat too much from the design astethic of G1 bionicle and will ruin the suspension of disbelief that they are characters in this universe. Despite this I'm not of the opinion to ban or remove custom entries but that custom stuff should either be recognisably bionicle in aesthetic or built in a way that their design language don't contradict or conflict with already established designs in the bionicle universe.
Which brings me back to my original argument because if there is too much freedom we'll end up with figures like Nikila who don't look like a Bionicle at first glance and that I think destroys the general atmosphere of the world. Hence why the dh/rahi builds made by kids back in the day works better because they don't stick out like an eyesore on a shelf in a bionicle collection.
Now I know many moccers want to show off their fantastic skills and overall proficiency in the art form rather than building standard set like figures which I can totally respect. Even so I think that holding back a bit on the over the top art masterpieces for this contest is reasonable as the rest of the universe in which these characters will inhabit isn't masterpieces of art by any means.
This is just my opinion and I rather take this discussion now than half way through the contests. Anyone is free to disagree or comment further on this but as someone who wants to recreate several of the contest winners, I and many others will find over the top mocs to be a pain and no fun to build. That's my final 2 cents on this however feel free to bash or dwarf my argument however you please. If you agree and have something to add that's fine too