This is a picture of the Ecto 1 I drew in AutoCAD (A computer aided design program). It's got parts from the Ecto 1, and the 1a. It's pretty square, because I haven't been taught how to use things other than the straight line tool, and the circle tool! Also, I think you can colour individual parts in, but i'll have to experiment.
Sorry it's so small, I had to make it small enough for the file size limit.