@LukeAlmighty @nukie @Duine for the homeless, not as an investment
I unironically looked into building one of these:
1) Forget about it if you want to start combining containers. You have to hire a welder, and you also have to reinforce any cuts you make into the paneling
2) They ain't going to last for very long unless you also built a sloped roof on top of it. Standing water will rust the shit out of it, even if you buy containers treated for sea use
A manufactured home will be a better investment long-term