I recently received a guitar that had some serious damage to the soundboard. This is what happens when the gig you are playing at gets out of hand! No really, this is what happens when you tip over in your office chair and your guitar happens to be right behind you. Luckily, I was able to repair the guitar and make it as good as new. It was major surgery but the job was done successfully. It only took some swear words to make it cooperate during the repair and all is right in the world again. I have included a few videos below of the guitar being played.
 
The first thing I did was record all of the frequencies of the guitar so that I could reproduce them with the new soundboard. I wanted the guitar to sound as close to the same as possible. Of course, I had to remove the neck from the guitar to get started. Since I use a bolt on mortise and tenon for the neck joint, that was a quick task.
 
I then routed off the old soundboard. Unfortunately, the bindings and purflings went as well. Since I made this guitar almost 15 years ago, I still had some of the same binding and purfling material available. Some of the kerfing was damaged in the accident, so I just removed all the old kerfing and installed more. 
 
 
While all this was going on I made a new soundboard and attached it to the sides. At this point I started measuring the frequencies in order to reproduce the old frequencies as closely as possible. The old soundboard had scalloped bracing and on the new one I used ramped bracing. I show this style bracing in my acoustic guitar OM plans. 
 
Next was to cut binding channels and install them. Then the finish work began. Since this is one of my guitars and it was in for a major repair, I decided to refinish the entire guitar. It had seen some action over the years and was in need of some attention. After appropriate cure time, I reattached the same bridge and put the strings on. After a setup the guitar was as good as new. I was even able to pinpoint the box and back resonances exactly and the top resonance was within a few hertz of the old one. Mission accomplished!
 
Happy Building!