There have been a few discussions here about the construction of floating Islands and how to do them at home. The following should give you a good start. After that ask away and Hopefully we can give you a hand here.

http://www.pondboss.com/cgi-bin/ubbcgi/ultimatebb.cgi?ubb=get_topic;f=20;t=002890

http://www.pondboss.com/ubb/ultimatebb.php?ubb=get_topic;f=15;t=000036;p=1

http://www.pondboss.com/cgi-bin/ubbcgi/ultimatebb.cgi?ubb=get_topic;f=20;t=000678

---------------------------------
1/10 - 1/4 acre pond plus 16 ft deep/ Plus 40 ft by 20 ft by 6 ft deep koi and fathead minnow pond next to it. Upstate NY