floor pan patches--butt or lap weld

[whitetop]

I would butt weld it. Once you start fitting the metal you will find it is not that hard to line up.

I would weld the top and not grind down the weld. Once you get the time and capabilities you can always go back and weld in the bottom side.

I think you will regret it later..that is if you plan on keeping the car and not just flipping it.