Jeff at Die Waffenkammer's said the E-series are on his books, but he's busy at the moment.
I was going to make one from one of the E-100s on sale by Kings Hobbies and Games, though I wouldn't recommend this for others. The model isn't massively detailed, so you'd be better off either hoping Jeff comes out with something or having a go at resizing a 3D printable model.
I don't know how Heer 46 makes their models, but IIRC they had an E-100 in a smaller scale. If there's is 3D printed than they might be able to sell an upscaled one (I wouldn't hold out on it, I've been asking them for their rocket kit for a month).