Is this your car, or a purchase you are potentially considering?
If the former, best of luck. Dealer and highly-recommended independents are your only options.
If the latter, the only way a flood damaged car is ever a good deal is if you are willing to do the vast majority of the labor yourself. You are never going to save money long-term paying someone else, even if you use a skilled Porsche independent. It's simply a tremendous amount of labor on any car to ensure everything is as it should be, often with lots of parts being replaced with it. If you have the tooling, lifts, etc. it can be an interesting way to spend 12 to 18 months of your free time, ultimately learn a car inside-and-out (and know it like the back of your hand), and end up with something in perfect working order (assuming you do all the due diligence). Though unless you have the lifts, experience, time and money to buy the car and the replacement parts... move along. It will never be a good deal unless you meet every one of those criteria.
TL;DR: Flood cars are for people willing to do at least 90-95% of all the work themselves.