I have such a love-hate relationship with the Frostelus model right now. I had a bit of foreknowledge of the species from the books and one-off mention in the comics, but since canon couldn't decide if they're Rahi or not, it didn't make the Rahi Beasts book. I was tempted to try and build one from scratch a few times but never quite able to come up with a Toa-slaughtering design.
I finally found it online in the past couple years. In images it does have a certain intimidating charm to it, but the physical form is really gangly and unwieldy and hard to pose right. I'm now working through an idea of a revamp, not wholly G2, just enough to give it a little more in the way of armor, stability, and actually useful posability.
Side note: You though that 6-long liftarm that saw a lot of use in the Slizer era but hasn't been seen since Nivawk? Turns out that piece fits like a glove to span the gap between the two massive shoulderplates. Like, really. It even has the 45 degree shaping in exactly the right spots. If I ever find-the-time-slash-get-over-my-shyness and post it to the board, I suppose I can leave a link here.
Meantime, fave Hordika combiner is back to being the Rock Raptor.