The boat below is one that he made about 20-25 years ago out of cardboard and balsa/bass wood.
The boat below is a model kit he assembled of one of his favorites, the Nautilus.
The boat below is another model kit of the Santa Maria, something he assembled before I was even born.
And finally another 25+ year old cardboard and balsa wood boat - this one we used a lot in our dungeon and dragon games.
I'm so happy that my father was ecstatic about these shelves. I believe he now plans on making better bases for his ships now that they are on display in his work room rather than in the closet.