I admit I haven't read through all the posts (sorry if I'm repeating something)
What if the "maw" were articulated, like complicated jet engine feathers...and, perhaps some of the layered greebles could evoke the look of a jet engine, in an ancient alien sort of way.
(layers of pipes and tubes and pump/carb looking "stuff").
Or asymmetrical pieces of old armor still left clinging to the structure.

What if the "maw" were articulated, like complicated jet engine feathers...and, perhaps some of the layered greebles could evoke the look of a jet engine, in an ancient alien sort of way.

Or asymmetrical pieces of old armor still left clinging to the structure.