The Adams don't have arms or visible legs, unless I'm missing something.
I just find it really odd that there's no reference whatsoever to it in either 1 or 2. Nobody ever drives by it or complains about it being an eyesore or wonders about how it got there. They just completely ignore it; no, not even that, because that would imply that they think there's something there to ignore. It's not even clear where it is, although the surrounding shots indicate that it's probably in Tokyo-3.
The other thing that throws me about it is the size of the head. It's a little large for it to be an Eva, although I guess an MPE with its head thrown back would fit. The Adams would fit a little better, but they have limb issues.
I just don't even know.