The top pic reminds me of a story.....
Elderly couple in small boat.
The heads system was of the bucket and chuckit type.
Heads situated under the fore hatch.
It was more comfortable to open the hatch for headroom.
Old gent was sitting comfortably enjoying a pipe when he noticed a bucket aft
"I did not know we had another bucket on board" he said to wife.
She replied "We don't"