Anyone have any ideas how to restore this???

I have my 1960 Plymouth valiant v200...the interior door panel's are old and mainly the bottoms are bad. It seems to be cardboard? Anyway, does anyone know of a way to restore these without spending alot of money for new replacement panels? I was going to recover them but the actual cardboard skeleton. Part is to not too good anymore.

Just needing some ideas.


1/8 inch masonite is what I have found to be the best and it holds up super well. If your cardboard is thicker you could use 1/4 inch.