I'm replacing the floor with a one piece floor pan. For the floor pan to attach to the toe board, trunk panel seam and frame rails, which side did the factory put the spot welds. Where the spot welds done from the under side (like the sides) or where the spot welds done from the inside.
What I see most restorers do is drill strait though the old spot welds for the trunk and front toe board panels. Then they would fill the old hole with weld to attach the new metal. With enough practice you can make it look like a factory spot weld. However you will need to drill holes to on the floor boards to attach it to rocker.
I'm all for the factory appearence look but in the end how many people are actully looking under your car. Seam weld will do just fine as well.
I did my floors by drilling and then filling the holes in with MIG (plug welding) - Then I welded most of the seams as well for good measure. My car's a driver though so I'm not as interested in originality.
