CBS-D is a little too good, because we're seeing all the flaws of the 4-footer:
The 6-footer was built to stand up in a feature film (which it later did) The 4-footer, not built by ILM, looks like it was meant for TV, and we're seeing more than we were ever intended to.
Notice the warp pylon - the edges look as if they were spackled. There's also a gnarly crack that extends from the neck. A bit of sanding prior to painting would have fixed that. The model wasn't even a year old at this point.