75 Duster Tetnus Shot and band aids

Removing more of that crap that is covering the floor. I'm just going to get the crap off of the perimeter of the floor pan and where the floor is welded to the floor supports and crossmembers. Got an old Airtex fuel pump that was screwed to the floor removed. Question does the floor over lap the sheetmetal piece that goes under the rear seat? There is a seam under the car just in front of the rear frame rails. Is that the under the rear seat piece that the passenger floor is spot welded to? The floor looks like it is welded on top of it

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