The Grumman C-1 Trader is a derivative of the Grumman S-2 Tracker. The Trader is a transport version (used for COD) and many airframe components are similar to the S-2 Tracker anti-submarine aircraft. The C-1 has seats in the fuselage and some additional windows.
This C-1A with serial 146048/16 is at the Palm Springs museum.
Photographed November 2013 by Cees Hendriks, (c) Copyright IPMS Nederland
A scale model of the C-1 would use a S-2 model with a conversion. In 1/72 scale Falcon had a vacuform fuselage for the conversion.