A Coronado 35 in great shape might fetch $18-20K .. you can do better. It's not a great platform to begin with, a 'rotten' one's a non starter... that's a significant amount of delam and may only be the tip of the iceberg.
In today's market there's little need to risk such a venture.
1984 Fast/Nicholson 345 "FastForward"
".. 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)