
There is a small section of floor that's rotted beyond the sill so can see road through it.

Obviously I need to get a section of floor welded in, but to weld a section in covering the whole sill would require welding to the outer sill facing as the internal metalwork is mostly gone. That would probably damage the paint and need a respray of that section.
My question is this. Is the floor integral to strengthening the sill? I ask this because I could
1 get the whole rusty missing part welded, but that likely requires a respray of the outer sill facing
2 get a smaller floor section covering only the part where you can see the ground, but not 'close off' the sill. Ie not have the extra section of floor be welded to the outer sill.
So any advice welcome. Is this bit of floor structural or can I get away with option two?
Thanks!