1930 model a coupe model a ford garage body assembly.
How to install model a floor pans.
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Mark the center of each wall stud on the shower pan rim.
Replacing floorpans is one of the most basic sheetmetal jobs there is and among the most common.
Mark the outline of the shower pan on the subfloor using pencil or a chalk line.
Test fit the shower pan to confirm the drain opening fits over the drain hole in the floor.
With floor pans warping is not nearly as much of an issue so you can weld a little closer than 3 inches.
Welding solid bead will likely lead to a lot of burn through.
Even an otherwise rust free car will often have some swiss cheesing of the floors 40 years of wet.
Pre drill holes through the shower pan rim at the marked locations.