I got the new release ecto-1a from Ghostbusters2, but i want to do the E1 from GB1. AMT's kit has the decals for E1, but none of the parts (cheapskates). conversion involves replacing most of the roof rack and all of the interior rear area.
i started by cutting out the plastic that is inside the framework of the roof rack. i (eventually) cut off the mounts for the flasher lights as well. I also decided to cut off the Freon tanks and replace them with aftermarket NOS tanks. i replaced the removed bars from the roof rack and also added missing ones from the rear part.
Here's some parts i made and the added missing struts.
After cutting off some of the boxes, i ended up replacing the entire floor section of the roof rack with flat styrene.