You probably won't be able to get a spot weld drill to all of the welds, especially the area behind the front seats. The pan drops down for the rear passenger's feet and that hump makes it difficult to get a bit between it and the rocker. A right angle drill may work, but I didn't have one when I did my floor.
IMO, forget the spot weld bit. Just get you a grinder and grind through the existing spot welds under the car...it's much quicker! Plus, if your doing the full floor replacement, you're probably not worried about salvaging the existing floor anyway.
You can check out my cardomain site starting on about page 20. It shows the floor install for my car.
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