While I understand your situation and your motivations, I would reinforce the points made above and offer the advise that any boat is going to be more expensive to maintain than any accommodation on shore. Absent the ability to maintain it's insatiable needs, any boat will soon assume the condition of the one you now reside upon. In my opinion, you would be far better served by even a motorhome in even dilapidated condition.
“Scientists are people who build the Brooklyn Bridge and then buy it.”
Wm. F. Buckley, Jr.