This is the one I've been working on for the last year and a half on and off. Its a Pram Dinghy from RCM plans (April 1991 issue).
Its constructed from Sintra PVC and mahogany. Its big! Probably 1/4 scale. Kermit's hand is connected to the tiller arm, which is controlled by a servo which is hidden under the seat. So, it looks like Kermit is busy sailing the dinghy.
She's named "Miss Piggy" of course! Here's my build thread on RCGroups: http://www.rcgroups.com/forums/showthread.php?t=1275629