I could live on a "boat" like that....more like a floating house than a boat. Does it have a motor or is it a pull toy? I lived on a sailboat for two months and you get used to a little rocking pretty quick. That thing probably wouldn't move much anyway.
Make sure you get a survey done and check the size of the holding tanks on board. Emptying the septic might be a pain in the
if it's too small...