For anyone with genuine interest or just morbid fascination, I just posted a story on my boat blog about replacing thru-hulls on my Gulf 32. I tried to post a lot of pictures to clarify the process and outcomes, and let me just say it was a major PIA, but completely worthwhile. They were glassed in, flush head thru-hulls, just to make it more fun!!!
To see about my experience go to: Stories of Aeolus- Our Gulf 32 Pilothouse: Replaced Thru-Hulls and Seacocks-Down the rabbit hole
Feel free to contact me if you have any questions. I'm just adding my experience to the library of others who have done, or will do, this project.