I've built two guitars with torrefied tops and bracing. one is two years old, the other three. A slope dreadnaught, and an OLF small jumbo.
No glue joint problems with either one. The older of the two is still in my possession, and the slope D is in Colorado. Both are great sounding guitars (to my ear, for what that is worth). The aged woods are from Stew Mac. The builder has to be careful of splitting with the tops. Very brittle stuff. Ask me how I know. The last batch of bracing stock I received from S Mac was lousy. No straight grain. You can remove more material from the braces, but, as always it will depend on each piece. As far as the torrefied tops thickness, in general you can thin them more. But that as always will depend on each top. I make all my top and back bracing 1/4" wide. but I remove material from the sides of the bracing to achieve stiffness. Tall and thin, like a tall narrow triangle. This reduces weight, while keeping strength. I've seen different approaches to this. square cross section bracing, wider bracing but not as tall, etc. The torrefied tops i've used have always had a very good ring to the tap. and had good stiffness.
But that is a very small number of them. So I guess what I'm saying is you will just have to check the tops and bracing out one by one, just as with any top and bracing material. I use titebond standard for the tops joint, and or HHG for the bracing to the tops. As I said, no glue joint failures. Yet. Ha!
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