Re: Bracing for a thin soundboard
If it were me, I would think seriously about fashioning a patch for the thin area. The edges could feathered at the edges to blend right in with the rest of the top. If you did it cross grain, or perhaps 45 degrees to the grain, it would be very strong. You could think of it like you were cleating a crack, only pre-emptively. Reinforcing patches like that are common in violin restoration work.
I remember a thread a while back when someone took a Gibson Goldrush to a shop to have some work done that involved taking the back off. It had never been repaired before, and to both the owner's and the repair guy's surprise, they discovered such a patch on the top that must have been done at the shop! And this was a 6000 dollar mandolin!
Don
2016 Weber Custom Bitterroot F
2011 Weber Bitterroot A
1974 Martin Style A
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