I know of another basket case that is similar to this, and the seller can't get any interest in it from anyone, for half of this ambulances asking price. I know someone that purchased a Model A basket case, and it took over 3 years to put it all back together, while looking for all the small parts and pieces, and they were experienced with Model A restorations.
You would have to have another parts car along side of this one just for the hardware, and knowledge of how it was assembled originally. Putting the body back together won't be that difficult, but it is all the rest of the car that will be difficult. Who knows what condition the engine & transmission are in, and you wouldn't want to got to the trouble of putting it back into the car, without first going through it completely, because you wouldn't want engine leaks, or a bad transmission. I know that the engine work will run about $5000 to rebuild, and the transmission about $1000 - $1500, depending on what you find when you take it apart. Your upside down in this project before you even start. It will require careful packing of all the parts, and enclosed transportation just to get it to your location. What would you do if you found that a part or even worse, a bunch of parts were missing? My biggest fear would be the plater lost a part, and it went unnoticed, until you got that far along in the project. I misplaced the rear door handle for my 1969 Miller Meteor, and it took over a year until I found another, and it wasn't cheap, since the seller knew how badly it was needed to finish the car. I doubt that there is a Miller Meteor Criterion as a parts car anywhere to be found, unless Pete has one in his yard.
I would love to hear the backstory on why they are not completing this project since they have already taken it this far. Did the person that disassembled and started this restoration, leave or retire? Did they take detailed pictures of the disassembly? Certainly, it will be worth more completed, then it will ever be as a basket case car.
This one reminds me of the flower car that was for sale a few years ago. It was repainted grey, and was drivable, but a basket case, since it was not reassembled. Don't know what ever happened with that one.