The AMT ecto-1a isn't too bad of a kit. some of the details are off, but it's easy to build and looks ok. It's curbside and all the equipment is molded in. I was tempted to use the front grille from the Monogram 59 cadillac, since that has clear headlights rather than the molded chrome ones. In fact you could probably pull the engine from it too.
the new release of it says on the box that it can be built as Ecto 1 or Ecto 1A, but in reality, it's just Ecto-1A with a few extra decals for Ecto-1. the interior and roof-rack are not correct for Ecto-1. I'm currently trying to correct it.
my ecto-1a: