I’m rehabbing 122 sedan trunk. Interior next.

What’s the hot set up for relining, sealing, sound deadening, trunk painting trunk and passenger compartment, roof, floors, doors, rear seat bulkhead, firewall?

Trying for piece of mind ride not stereo.

Gas tank out, cleaned, sealed & painted.

Trunk area is original paint.

Removed the original ¼” “tar board ” pieces on the ¼ panels, deck lid, and rear end hump intact for use as patterns. Deck lid had curved fiberboard cover like ’40-50s truck headliners, the side covers if ever present are long gone.

Trunk speckle paint, rhino liner, POR 15, Damplifier damper?

Are new fiberboard 122 trunk cover panels available?

I know you’ve been through all this before, I can’t find threads.
Maybe an audio forum?