Top Plate (inside view)...
...This is my layout manila pattern showing the Stradovarius tone strips for the inside of the top plate (belly). This is how the inside of the top plate is to be arranged at the end of the construction process (the final tuning before assembly).
... According to to Author and researcher Isaak Vigdorchik in his book 'The Acoustical Systems of Violins of Stradivarius and Other Cremona Makers', this is the method faithfully used by both Stradivarius and Guarneri del Gesu.
... If you gently tap down the center of the marked diagonal strips, the tone will be as marked; and if you were to cut the plate apart along the diagonal lines, each strip would still give the same tap tone as when part of the whole.
... This is my layout pattern showing the outside of the back plate. Notice the wide central strip (marked E4 [in the octave just above middle C]). According to author Vigdorchik, Stradivarius made this central strip wider so that the sound post actually rests on the strip; also there is just one octave between the highest and lowest tone along the back, going from A#3 up one octave to A#4.
. ..Notice how this contrasts to the top plate tuning: there the central tone strip is D4 and the extreme tones are G#3 and G#4 so that at each point the top is just one whole tone (two semi-tones) below the back plate.
. .. It is this acoustical arrangement of the tones that is the foundation of the sound of fine instruments.
... The actual process of tuning these plates is well described in Mr. Vigdorchik's fine book .
___________________________________________________

...I want to add one idea to the above: I believe that if you tune your violin plates so that they produce an even tone all over their vibrating surfaces, then these Vigdorchik tones are automatically produced; probably due to the effect of different overtones.
...Then is there is any deviation from the Vigdorchik tap tones then you know that the plate is not quite an even tap tone, and you can adjust the out of sequence tone strip and this should bring the plate tuning back to the desired even all over tap (with a firm knuckle tap).
...To restate this a different way, the plates need both to have an even tap tone all over and still produce this Vigdorchik tone strip pattern!