Body measurements
 

I have a 1930 Model A coupe. I am wondering if there are correct measurements to position the rumble seat platform or is it positioned
in a general location. I realize it can't be moved around very much,
but would like to get it right.

Re: Body measurements
 

The platform was accurately placed exactly the same for each car.

The rumble seat platform locates based on the holes on the side rails and the front edge since they were riveted in place. If you have an original cross rail there should be the rivet holes in place.

If you are missing the holes then the proper question should be the location of the holes on the parts.