Our 83 westy has the original brown carpet.

I am planning on adding rails for a middle seat.  You can see the carpet,
the rails (and the covers we have for them) in this photo:
https://photos.app.goo.gl/MTSjzPBvZyRe1bYr5
(The rear bench seat is out in this picture).

I am planning on installing the rails without removing the cabinets, as
this guy does in this video here:
https://www.youtube.com/watch?v=RQAbf0iIt28

My question is about replacing the carpet with something else (more carpet?
wood?) at the same time.  Will I be able to pull out the carpet from under
the cabinets and then slide the new floor underneath?

Thanks!
Wes