Here is the latest on the body. The thin black outlines indicate the borders of the solid model.
It looks pretty good to me, but it's hard to say with any certainty, because of all the variable info we have. Unfortunately, there isn't a single image where the face I'm sketching is in exactly the same plane as a ruler, so there is always going to be a bit of an error margin.
I think maybe I should draw in some other parts like the lantern battery terminals and the antenna and maybe that will help us get a better sense of sizing.
Here is a pic of the new body with dials accurate to the size of the ones I have from @Nicksdad.
I'll try making the grill next.