When is a piece too far gone?

Looking back on this 90s restoration, I was faced with a choice of keeping the item for spare parts or attempting to piece it together. The previous owner had dismantled the French Renaissance revival secretaire bookcase and many of the decorative relief carvings had been planed off. There was also a fair bit of weathering. Fortunately, I had one of everything to copy, and so over many months I set about rebuilding it.