Talked to a guy a while back (~18' Stratos) that had his done by a reputable shop. They did a nice job but 3500 sounded a bit high to me. I've replaced a couple in aluminum boats and although time consuming, not an overly difficult process. The first one we used laminated cypress and it should last forever. The second one was a lot easier, we used Arjay pourable ceramic. Really the way to go. its stronger and lighter than wood, waterproof and rot proof. I know another guy that did his with seacast and claims it only took 2 evenings. Took him 2 more months to finish the paint but a little primer is OK for a fishing boat.