How do you remove Marlite framing?



My 1950's bath appears to have painted Marlite for walls. I plan to cover it with bead-board but need to remove the metal framing that's installed between each panel. Anyone have experience getting that out? I could figure it out if I knew how it was installed to begin with.
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Marlite can be painted over, by ix a bucket of warm water with dish-washing soap. ...
Rinse off the panel to remove any remaining solution, then dry the panel off with a towel or rag.
Lightly sand down the surface of the panels. prime then paint.
Or
Place a chisel at a 45-degree angle on an abutment line between two sections of the Marlite paneling you're going to remove.
Tap the chisel with a hammer to break the adhesive bond between the wall and the Marlite paneling, exposing the wall behind the paneling. If drywall is behind the Marlite, choosing to pry the drywall off along with the Marlite is an easier option, although with careful chiseling and prying the drywall is salvageable.
Continue to chisel and chip away at sections. If a panel allows for room in between the Marlite and the wall, wedge a pry bar in between the panel and wall and pry Marlite off. Marlite will break off in pieces and may shatter. Continue until the walls are free of the Marlite paneling.
Load medium-grit sandpaper into a belt sander. Sand off excess adhesive, then sand the walls with fine-grit sandpaper. Sand only the adhesive; do not sand deeply into drywall or it will become irreparably damaged.