True, what we are looking at is well above 1M personal property, and if the floods were not saline, I belive a good detailed cleaning after stripping down in to bits and pieces might help. Also there is a good reliable service provided by Kl**n P*rk for rust proofing.
Regarding the electronics there are people competent in that as well, since all those gadgets may not need replacements, and even a complete engine SWAP might not cost huge amounts.
I would say the car can be back on road, in reliable condition -but after spending one or two hundred thousands.
I would say worth it!