I just sold my 1989 Gemini 3000 and I miss it already. All the Geminis have floatation in all 4 corners. They aren't noisy unless you are really beating (never a good choice when cruising). The place to go for answers is the yahoo gemini group: http://groups.yahoo.com/group/Gemini_Cats/
Funny, one of the things I liked most about the Tomcat was the centerboard setup.