PVC covered wooden window repair

Hi.
I'm a wood restorator, I work with Abatron epoxy products. I mainly repair wood rot damage. This lady calls me today to schedule an estimation of a restoration on her home.

Two window sets. The first set has 4 windows, including 2 hinged casement windows and 2 fixed windows. The second set has 2 windows, 1 hinged and 1 fixed. The windows themselves and the window frames are made of wood, but covered with PVC.

The damaged part of these windows are mainly the sills, the bottom rails and the bottom of the stiles. Water came through the caulking and damaged the wood underneath the PVC. So I need to remove the PVC shell and repair the wood, then put that shell back on.

My questions are...

Is it possible to remove this PVC shell? If so, is it possible to reuse it after? If not, is it possible to buy new, identical one?

How do we remove a hinged window? The one with the opening mechanism. And how to put it back on?

How do we remove a fixed window? How to we put it back on?

Thank you very much for your help.
And just to know, how much would it cost to entirely change those 6 windows? Total price..


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