Though firmly centered on Martins, if you follow Bryan Kimsey, you will learn a lot about your guitar. People send him primarily 70s Martins. His conditions are that there is no time window for completion. Since he does many neck resets, and scalloping of braces, he prefers to wait for guitars to settle in, and that takes a while. He does not want to over scallop. When completed, he likes to keep them for another month.
My daughter had a tragic top split accident with her cello, and a violin maker made a new top from a thirty year old piece of wood. To say it was disappointing would be an understatement. Six months later it was singing.