Cult of Dan Brown: The Holy Grail Is NOT A Cup!

The puzzles presented in the Da Vinci Code and Angels and Demons intrigue me. Dan Brown gave a great explanation of how the Templars used cleverly disguised anagrams, and hid them in public places.
When I later read Holy Blood and the Holy Grail, I wanted to try more. I read about the mystery sculpture, a Reverse bas relief of a Poussin painting, at Shugborough House in England Unbreakable Code it says that the code can not be broken, its inscription DOUOSVAVVM could not be deciphered.

I tried to solve this puzzle and thought. What if the inscription was a Templar clue, a pointer to something else on the path to the grail?. Why was the bas relief done as reverse of the painting? Why was a casket added, what did it hide? There seemed to be a clue in another place, one with Templar connections and showing the "pyramid". It was a headstone with the date incorrectly carved.

It took me four hours to solve the puzzle using that approach. Here is my solution to the indecipherable inscription:

The Shepherd’s Monument Mystery – Solved.
I will not go into all of the references, they can easily be found on the Internet. I would suggest looking at the pictures of the objects mentioned.

Background Information (not in order)
Village of Rennes-le-Chateau is perched on a rocky outcrop.
Antoine Bigou miscarved the date MDCCLXXXI (1781) as MDCOLXXXI. He changed C to O (not a Roman Numeral). His uncle preceded Sauniere as abbot at Rennes-de-Chateau. Carved Headstone
Poussin painted Les Bergers d’Acadie (1635-50) – the title is French, Poussin was a Templar Grand Master. Poussin Painting
Sauniere discovered a parchment (1891) which read, in part, “Shepherdess…Poussin…KEY…”

Location in the Poussin painting is Les Pointls, near Rennes-le-Chateau.
A reverse bas relief carving of Les Bergers d’Acadie, by Stuart is located at Shugborough house near Staffordshire England (1755) Reversed Carving
There are eight letters on one line of the bas relief, two letters on next line
Sauniere decoded the messages and found the Grail even though he was not a Templar initiate – he did not possess the esoteric knowledge thought to be needed.

Solution (Order of learning the clues is unimportant):
Poussin painted Les Bergers d’Acadie, it depicts a shepherdess. CLUE
Sauniere parchment refers to Poussin KEY # 1
Location can be determined now, if you have KEY #1, and access to painting.

Bas relief in England is a “REVERSE” of Poussin’s painting. CLUE
There are 10 letters on inscription, eight on one line. CLUE
Bas relief adds a casket obscuring view of Rennes le Chateau. CLUE
Bigou replaced C with O KEY # 2

To solve:
Read the word REVERSED (i.e. upside down and mirrored) Now, REVERSE what Bigou did - replace O with C in the eight-letter word.
The modified line now looks like:

AAVASCNC
This is an anagram, in French: "Ca Canvas” meaning (That Picture).The bas-relief in England is obscuring the location of the Holy Grail in France. You need to see the original painting to find the right location after you find KEY #2. D and M seem to be meaningless, outside the clue. This clue is pointing the way, a path to the grail.Done in classic Templar style.

Obviously
The Grail can be found without the bas relief, if you have KEY # 1
The Grail can be found without the parchment, if you have KEY # 2.

Next Puzzle to Look for: Do the carvings show a "Path to the Grail" similar to the "Path of Illumination" in Rome?" Both prominently show pyramids.
Casket shown in bas relief by Stuart (1755) has a pyramid on top of it.
Mis dated headstone by Bigou (1781) has triangular peak top (pyramid).
Is headstone of 1781 a replacement key for the 1755 bas relief? Where is the old key? ca 1755?

--------------------
A meaningful journey starts with a step in the right direction.

Post Extras: