You may be providing awesome advice. I have purchased two W220 flooded s-classes. Neither of them ran or drove, but they do now and they are both on the road today. But I also understand I was lucky and not smart/ good.#1 rule of buying flood cars for fun and profit is to buy one that already runs and drives.
#2 rule of buying flood cars is, if you break rule #1, pay no more than parts value. On a 10 year old S-class that's 3, maybe $4K tops.
I've done good with the few swimmers I've had, but you have to know what you're doing and buy it right to begin with.
Above is the link to my engine fire S500 rebuild. Thought on the street was to never by a car with a engine fire. That car purrs like a kitten, but I only paid $350 for it at auction, not $6,000.... so your post is well noted.