I opted to go for a "small" area and just tackle on side deck. Using a circular saw I cut a line up the starboad side deck along the toe rail, then back down along the cabin. Then I divided it into 4 good sized sections by cutting across the other way. I finished the cuts off with a dremel with a metal cutting bit which worked very nicely.
I went after the section I thought had the most problems. Not much delamination here, and it was a real pain to peel off and clean out. I spent the better part of the afternoon chiseling and hacking the not-so-bad core out of the area...