Thanks for that, chaps. Since the deck is beyond economic repair - there were no internal bulkheads at all to reinforce it, and because I can find no photos of the HFM tug on t'web, I've decided to remove the deck and put a freelance superstructure on her. The present rudder tube is wonky so I shall extend the keel under the prop to the foot of the rudder. I need a slow vessel for the Irvine Museum pond. I can also use up some odd model bits, and I'll have to see if I can find the styrene sheet - I'm sure I had some somewhere!