I am looking at a 18?x40? frame and toons for a houseboat. It is floating down at the local marina and has been there for years. The lady that owns it is considering selling it. She has not put a price on it yet. It has 4 toons that run the length of the frame. It floats level, seems solid enough. Have not really inspected it close. Has anyone built a house boat before? What should I consider before I start? I am thinking of leaving a porch on the front and back and Having a basic cottage in the middle. I would be doing all the work myself. Any ideas?