If at any point you're concerned that someone will become aware of the repairs in your floorpan, or their authenticity/provenance, just go to a car show. Watch how nobody will stress his/her beer belly nearly enough to examine the underside of your car. Hack away. Just make it as awesome as you need it in the best way you know how.
At what point in history did "experts" decide that automobile assembly welds needed to be more visually appealing than ____ (insert favorite proper noun here)? The more you take one of these old cars apart, especially with a useful tool like an air chisel, you realize that nearly anything a half-competent person would do with a MIG welder, a modicum of skill, and some nice, clean steel would be better . . .
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