Replacing Polybutylene Tubing under BATHROOM

[rdwatson]

1983 Casita 16ft -- Upgrading and replacing plumbing - The Original Polybutylene 1/2" tubing with 1/2" PEX before the predicted floods occur.

BUT -- How does one extract them from beneath the bathroom floor ??

Can I attach PEX tubing to the water lines inside the front closet, and pull all the tubing out from the front room bathroom wall -- Dream on ?? I'm guessing that the lines are likely attached under the floor.

OR -- How does one remove the floor of the Bathroom to expose the Original water lines ???

All assistance is greatly appreciated !!!