FWIW I almost always thin out the perimeter of the top along the lower bout to loosen it up. I don't think tapping an unfinished box is very meaning full. It's hardly meaningful to tap a finished box. What it will tell you however is if it is acoustically dead or has a nice ring to it. If it's thuddy then it's most likely over braced.
What is the purpose of the design of your X-Brace? In particular the scalloped out section at the X junction. I've never seen that before. As was mentioned before and before it's too late you will really want to add some sound hole braces.
Also I like that lining. I'm not one who really cares about the inside of a guitar but those linings look cool.
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