If you're going to actually leave the dock in your houseboat, ixnay the
"dropped" ceiling. IMO.

When you get into steep headseas, you may discover that your drop ceiling is
indeed dropping all around you, just when you need to concentrate on your
seamanship rather than picking things up off the cabin sole. Stuff should be
well secured. Construction materials and techniques that work in a home or
office structure, (that won't move more than a few inches even in most
earthquakes), aren't always suitable for a wet, active, environment such as a
small pleasure craft.