I don't think any two of these cars are the same. Buying reproduction sheet metal is risky, especially for pre-war and at this price. I'd see how far you get with what you have. If you can't do the metal work yourself, you should find someone who can. Having been through both a Cab A and roadster, getting the original pieces to fit is hard enough.
I can already see one problem with the reproductions. The flange at the rear of the fender is not 90º, should be more like 45º. You have a bigger problem with the rear deck of the body.