Interesting threat, hope I'm not too late to comment. I agree with Chris F, there is an advantage to be had by standing out from the crowd by offering something slightly different like this converted boat, Sonia. I thought that converting an old narrow boat would be a good option as it has a flat bottom so would be easier to support, they also have integrated toilet (often cassette toilets that you find in motorhomes), showers and kitchens. They also usually have wood burners which could help extend their season. I'd love to know what you all think of this idea?