Hi tug, welcome aboard. You ask for advice and mine would be to start with something smaller than the Westbury engine. From what I remember reading about it the engine is fairly large physically and would also require a fairly large boiler. To fit in the machinery and have sufficient buoyancy you will need to have a fairly large hull. I have a large (6'6", 2metre) steam powered tug and although I enjoy sailing it takes some getting organised. I need help to launch and retrieve her and have to add the ballast after she is in the water. I need another person to help with the lifting. She certainly attracts attention but I tend to only bring her out on important occaisions when there are plenty of helpers available. A smaller paddler, say 1 to 1.3 metre would be a lot easier starting point and there are plenty of engine plans and kits available. By all means stick with the steam idea, there is nothing I enjoy more but perhaps a more manageable boat as a first effort. Hopefully there will be a photo or two of my Waimarie attached. Best of luck, Ian.