Could be that someone, at some point, decided to put, say, a J24 keel on something like a Luger (the hull/cabin alone could be Luger).
If so, even more reason to be skeptical.. that kind of thing requires good engineering and reinforcement over the original configuration.
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
1984 Fast/Nicholson 345 "FastForward"