My question is how fatal is this. Can my friend buy this boat and go sailing. 1989 for 19k. The first picture shows how the bottom aft is pushed up a little.
The second shows the crack on the forward.

The third and fourth shows interior. The interior stringer is pushed up a about 1/8 to 3/16 but does not appear to be cracked.

The fifth shows three stringers. The middle stringer seems to be pushed up 1/8 to 3/16. The only cracks I can see on the stringers seems to be the stuff on the sides as you can see.

Can this be let go or is it a boat killer.

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What is holding the keel on? Is it damaged? I'd wonder if the keel is now wobbly under sailing loads because of the sprung floors.

Seems like a never ending can of worms to me. Without dropping the keel, who knows?
Perhaps your friend might want to hire a surveyor, one especially familiar with Bene's.

Why bother with so many other boats for sale without major collision damage?

Too many problems. I agree with the above. Find a boat for less money, in better condition.

Obviously hit something - HARD. Unless this was an absolute bargain (it isn't) and I had a good idea of what would be involved in the repair, I would run like hell.

Can't think of a single good reason to take that on.

David, re: the interior photos - are the rusted bolts and nuts on the port side of the keel and there is another row off to the right? They look pretty rusted to me. I'm a little surprised that there isn't a keel stub under the hull. Does Beneteau mount their cast iron keels directly to the hull? I would have expected to see more tearing and cracking on the tabbing for that last stringer to account for the "dip" in the hull. Could it just be that the hull just needed faring? For me, the rust by itself would be a sign of a bigger problem. I guess those who have cast iron keels must keep very dry bilges?

Just one row of bolts.
Every 20+ year old bene I've been on has had rusted bolts like this.

This is supposed to be an advantage of iron keels. You can supposedly back those bolts out and replace them as they are threaded into the keel.

In lead the bolts are cast in and melting them out and melting new ones in is supposed to be a bigger deal.

I agree that I expected to see a crack in the stringer. Maybe what happened is that the stringer popped off the keel at both ends where I can't see it. That way the stringer wouldn't have to deflect that much.

No stub. The keel is bolted to the hull as far as I know.

19 grand for a seriously damaged 26 Y.O. 28'?

I think the owners brain must have gotten damaged along with the boat.

Around here they'd be lucky to get $5K