Another data point. I've trashed many cabinets that weren't as bad as this one. It's not a human life, it's not a marriage, it's just sawdust. I wouldn't feel any guilt whatsoever about trashing that cabinet, heck I'd even feel good about ending it and the storage space it's been taking.
To rebuild it properly, you'd effectively replace 95% of the original cabinet. What's the point in that unless you just feel like building a cabinet? (Many of us have also done that…)