So, went about trying to restore the original. This car has been in my barn since 1975...was taken apart by the previous owner.. (who passed away)
Everything is there....boxes of bits etc. all there. The parcel shelf was in three pieces.....luckily, the original speaker covers were still there.
I was able to join the three pieces back together. However, there was quite an obvious visible joint.
Carefully removed a few thin slivers of the top layer...and used a corresponding piece to cover the joint. You can see where I took some of the pieces...that area is covered by the rear seat. Had some vinyl spray paint mixed to the color (as per Peter's color..BABIES NAPPY)

Now to the problem....the hardboard is warped....looking for some tips on how to get it flat again....