Realistic Skullcrawler

A truly unusual case of insular gigantism, the infamous skullcrawler (Megamphisbaena calvarinsularis) is not only the largest lepidosaurian predator on Skull Island but also the largest living amphisbaenid and the longest extant predatory lizard known to date (unless someone stumbles upon a two ton varanid or something, which has been known to happen). 

This is of course my hastily put together entry to Joshua Knüppe's Spec Evo challenge (that until yesterday I thought I'd have to opt out of). As a disclaimer I have to point out that I haven't seen the new King Kong movie, but I've seen the trailers and I know the original O'Brien lizard puppet the skullcrawlers in the movie are based upon. I know my skullcrawler isn't big enough to fight an ape the size of a skyscraper, but then if it was, it wouldn't be even this realistic, would it?

Edit: having seen how everyone else has approached the challenge, I sort of feel bad for not coming up with anything more creative, but I decided to prioritize realism and here we are.