We did talk a lot about doing stuff with the armour that would fit each behemoth better, but really it comes down to being a time thing. I would absolutely love to do some more snug fitting armour for behemoths (not necessarily "designed" but more layered on in an interesting way, like a caddisfly but instead of rocks its bits of future scrap).
I uploaded some ideas we were exploring for elder shields here. Scroll down to the last two images if you'd like to check it out:
https://www.artstation.com/artwork/3dY9Bg