Well Nord Icelandia sailed today, complete with submarine on the back.
The rx I got from Blackpool show has stopped working so the one I had in the speedyboat had to be used instead, not sure why it stopped, it just did. the paddle doors of the gripper mechanism were giving me problems as well, however removal of the slow-motion unit seemed to cure that, even though it was on a different channel to the doors.
Stability: despite concerns from Dicky D regarding the roll centre of the ship with all the new gear on board, the ship rolled no more than she did when first sailed.
The submarine's transmitter has about 6 feet of range, so any deployment will have to be done close to shore, though as it stands now, its all systems go!