The last step before gluing on the top is called "voicing the top". The braces on the back of my top are meant for not only strength and stability but play an important role in how the guitar sounds. So voicing involves a process of checking for stiffness as shown by my teacher David Vincent.
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Tapping the board and listening for the value of the tone.
Then shaping and resizing the braces to get the best possible sound.
Here is a before and after...