I have a 100% complete, #s matching Quantum, but the cabinet sat in a warehouse and soaked up water like a sponge. The top, sides, etc are swollen beyond repair. No amount of wood hardener, resin, bondo, fiberglass would make it usable. I thought it was ideal for me, as the crap cabinet made it somewhat affordable.
Plan is to build a new cabinet, reuse the plywood bottom, the upper and lower rear pieces, maybe the monitor mount. I'd be retaining as much of the original as possible.
There are times when a complete cabinet has a completely swollen and falling apart cabinet. A new cabinet is perfect for this. It will never be all original, but the cabinet just becomes one of the new 'parts' in the project, albeit a large one, and the other parts stay together.
I have a Qix, a Centipede cabaret, and a BZ cabaret that are same way. Very rough, swollen up cabinets.