A general bit of advice when it comes to Toa MOCs and proportions is that, if you're going to aim for something that looks as close to an official Toa in shape as possible, remember that Toa aren't human.
When the Inika build was in full-swing, certain reviews (CoughBZPcough) tended to pillory the sets for having short torsos and long arms, decrying them for not having human proportions.
However, the original Tahu looks like this when standing idle:
His torso is fairly short, and while his arms are uneven, the one that has a hand is hanging down to his knee. The arms are also generally about the same length as the legs.
Toa also tend to have shins that are longer than their thighs.
These elements are even more pronounced in the Matoran, who very often have arms that are outright longer than their legs.
Now, that's not to decry anyone that strives for humanoid proportions with a Toa or Matoran build, but more a general bit of advice for anyone aiming to directly capture the most canon-accurate Toa form possible.