I've never been able to find the precise and exact type of measurements you would need for a deuce body anywhere on the web. The problem is that while these bodies may appear somewhat flat and boxy they are, in fact, fairly complicated. Any dimensions you might find on the web will probably be for very limited cross sections of the body. If you want to build an exact replica, I can't imagine doing that without an original in front of you to work from. And from my limited experience, you'll need to have access to that original throughout almost the entire fabrication process.
I don't want to sound too pessimistic here or discourage you from attempting this project, but if this is your first shot at fabricating a body, I would recommend keeping things as simple as possible and shooting for something that might be eye catching and "era correct", but not necessarily an exact replica.
I'm not sure this will be of any help to you but you can see the entire step by step design and fabrication of the roadster shown above by going to
this journal. You can also see the step by step design and fabrication of the sedan deliver pictured below by going to my other journal
here. Obviously these bodies are not exact replicas of anything...but I believe they do convey the line and the feel of many late 20's and early 30's cars. And they were far simpler than attempting an exact replica.