You are exactly right! Nothing molded in for the radio, dials, or speedometer. I had to freehand everything, This kit really feels like it was meant to be a cheap die cast. So many details that are lacking. Here is my attempt:
To contrast this, I am working on the new 2010 1/12 GT500 Mustang kit out from Revell. Compared to the `65, I am almost convinced that if I shook the box to the 2010 kit, it would eventually assemble itself. It is a pleasure to build that after this one.