Umbraco Dynamic Content

Umbraco Dynamic Content

Consider this page: http://getbootstrap.com/examples/carousel/#
Here you see a header, and some navigation. But below it, you see these
"featurettes", which all are responsive and come in different sizes.
My issue is, that I want this behavior on my site. But I want to be able
to control, how many "rows" there are. I want to be able to say, I want a
row, with 3 columns here, and a row with a 4 column space, where one part
fills 3 columns, and the last one takes up the last column.
In my head, the right way to solve this is to make Document Types for each
row.
And in their respective templates I make the HTML I need, to achieve this.
But my issue is, I don't know wether this is the right approach, as
DocumentTypes gets links, and I would never want anyone to be able to see
that document type, by its own, it should always be rendered in its own
page.
Second of all, Im not sure how to render the DocumentType in its
parent(not it's master page).
I hope some of you know how to solve this problem. I can't imagine a page
that is that static, that I can only write in box1 through 3.