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It can get pretty dry here in the winter, noticing the garage door and 4 wheeler in the background, I thought humidity. I wondered whether the geometry issue could be humidity related and the soundboard a symptom of that.

Yeah I've all but given up trying to humidify the shop. It's in my garage and the only thing between the shop and the outside is a poorly insulated garage door. I never open the door but when it's -48 outside like it was last week the heater pretty much runs constantly just to keep the garage between 50-55 degrees. I still run the humidifier although it's probably futile but the humidity is usually 22-25% regardless of what I do. I figure- at least it's constant. I wouldn't sell this guitar, for me it's about the experience of the build and having something to play.

The geometry of the top where the X brace is still has a nice dome. Behind the X brace it flattens right out almost dead flat. I screwed up the dovetail on the first neck, but luckily my plan was for a baritone. It would have been way to low as a baritone and the neck screw up would have made it even worse. So I just changed the scale length from 27.5" to 25.7, shortened the neck with the new dovetail and moved the bridge a bit forward (back up on the domed geometry of the top. It seems like it will work out but first I have to make another bridge.

It's warned up from -48 to 22 degrees. Humidity is now all the way up to 36% in the shop. How long should I let it sit at that level (assuming the deep freeze doesn't return) before gluing the bridge? Once complete it will live in a 40% humidity controlled room in my house.