Looks like it unfortunately ended up in the archives, but this was discussed sometime within the last month in another topic. My memory is horrible, but I believe we agreed that the Metru Nui Matoran design was the "default". (Because there were just so many Matoran of that style?) Don't quote me on that, though, ha ha. As for Toa, there isn't a default. Though, I suppose you could say that some of the first Toa were the "default", because, yes, while your armor design will shape itself upon transformation to whatever you perceive a Toa to look like, later generations of Toa would have had to base theirs on something. But again, there technically isn't.
I believe the topic you are looking for is here, or something similar. Wasn't lost in the archives, just dead.
And according to BS01, Toa had a default size in the story, but not in sets due to different pieces used(or something like that). Though there are exceptions, like Takanuva absorbing light energy in Karda. Not sure if it applies to Matoran, but I'm pretty sure it does.
Thank ya. Must have missed it. XD So, most Toa would have had the same basic design (with their own take on it, of course), were it not for the toys and the need to have something different every year. Seems logical to me. And this not counting odd cases like Takanuva getting an "upgrade" in Karda Nui (again, mostly a toy thing).
As for Toa, there isn't a default. Though, I suppose you could say that some of the first Toa were the "default", because, yes, while your armor design will shape itself upon transformation to whatever you perceive a Toa to look like, later generations of Toa would have had to base theirs on something. But again, there technically isn't.
Lesovikk and Tahu. Both original Toa, very different armor. Also this is why Takanuva looked like a Nuva even though he's just a regular Toa
Let's not forget that the Mata weren't seen for years, so it's unlikely that any Toa before the Great Cataclysm based their design on them. Lesovikk, meanwhile, has been traveling the MU for ages, so the chances of Matoran basing their Toa designs on him are greater. If Takanuva had known (or rather remembered) what the Toa Metru (and others) had looked like, I'm sure his deign would have had elements from everyone (or from Toa who's designs he liked best). Let's also not forget that the only visual representation of Lesovikk we have is that of him after he enters the Pit. We don't know (or at least I don't know) just how much the Pit waters mutated him beyond being able to breathe water. Could have been drastic, could have been minute. He could have originally looked like the Mata for all we know, or vice versa. He's also had years to collect pieces of armor to fix himself up with, thus altering his appearance.And the whole idea of Matoran making themselves look somewhat like Muaka or Skakdi amuses me.