My yard removed the aft port frame and window over the summer. They had specific instructions to get it out in one piece to allow me to reinstall in the future. They pissed and moaned for two days, but finally got It out. They mentioned that Hatteras must have used 4 tubes of 5200 to secure it. Ended up using a thin bladed sawzall to cut through the glue, but had to be careful not to damage the gelcoat sides.
Bottom line, its a job, but can be done with some patience.
Why did we remove it? We put back to back flatscreen TV's in there for the salon and aft salon. Turned out great - but it was a lot of work.