Steam the neck off, it will need to be reset when you are all done. The back crack should probably have a piece of whatever kind of wood that is fitted into the crack and then cleats over the top. Rebrace the back. The guitar was built with hide glue, you should use that for any repair as it will reconstitute with the old stuff. The top ladder braces look to be OK, repair anything that isn't.

Once the box is closed back up you can reset the neck to match. You probably will have to do serious fret work - I would probably pull them all, sand the neck flat and refret. One big advantage of the tailpiece is that you don't have the rotational torque at the bridge, only the perpendicular component and with reasonable break angle that shouldn't be a problem.

I appreciate the input!

Should I attempt to somehow flatten the top? It’s really warped near the sound hole and on the upper bout due to the neck pressing down in that area from tension.

You might add another brace in the upper bout, maybe something like a popsicle, but I don't think you will have any luck trying to flatten it. The whole idea of doing a neck reset is to make the angle work with the geometry of the guitar, what ever it is. As long as the upper bout has not failed structurally I would just reset it to the bridge you will be using.

A popsicle brace idea is a great one! I think that’s the way I’ll have to go before attempting to take the neck off for sure

So upon further inspection. It seems as that the fretboard is completely broken at the fretboard extension. I had some fun and some high hopes. But I fear this one may be too far gone in terms of giving it a proper repair. I would think making a new fretboard is out of my league as of right now.

Ok. And just to be clear. An old espresso machine, a good rubber hose from the auto store, and a needle to pump a basketball should do the trick?