Some Cab Questions

[motorcity23]

Have my cab tore down, getting ready for blasting, or maybe chemical stripping with e-coat. A couple things I am unsure about;

1, Are these small knobs in the floor to line up a rubber floor mat? There are 3 on each side of the hump I think. I plan on grinding them down if there is no reason to keep them, I'll be putting carpet.

2, Have the corners of my floor been patched? Would these be factory? Similar on each side.

3, I have 8 screws going through the floor under the driver seat area. Odd pattern, I cannot figure what they ever would have been for. I plan on welding them up.

4, Before I try to clean the paint off. Is this some kind of data plate? I couldn't see through the paint in person, only noticed it in the photo.

5, This forward portion of my tunnel cover is welded in place. There seem to be holes where it's welded, as though it was once bolted like the rear section. Factory? I think I'll dill some holes and remove the welds. Might be some nice access some day.

Thanks in advance, Tom