Hmmm, an odd kind of craft, freelance at a guess. Maybe based on a Continental river cruise boat. The top passenger cabin doesn't look right, perhaps made the vessel a bit top heavy hence the oversize keel. The wheelhouse would look better down on the next level with a 1960s style funnel. There is too much rake on the mast. Judge scale by the size of biggest door. Figures from model railway suppliers, including crew in uniform and civvie passengers for most periods. Could look good all white flying Swiss flag or Lake Chiemsee in Germany. Keep us informed, with pictures of course. Post a couple more of the hull, prop, rudder etc.