I can't remember about the cranks right now but the sill plates go over the windlace and kicks. They should be installed last or removed first.
The original carpet in my 70 varied from half an inch to nearly the width of the sill plate over the length of the plate (narrowest in the middle of the door opening IIRC). I think you are meant to lay the carpet for best fit and then use the sill plate to cover and hold down the edge, where the edge actually is beneath the plate doesn't matter.
Stu
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