I did give an example of possible content for your StoryInterface special passage, it shows the content of the current Passage within a default Bootstrap container element. It allows you to use other Bootstrap elements within the content of the current passage like so..
<div class="col-sm-4">First of three columns</div>
<div class="col-sm-4">Second of three columns</div>
<div class="col-sm-4">Third of three columns</div>
<button type="button" class="btn btn-primary" data-passage="Library">Next</button>
.. the above shows a three column table and a primary button that forwards the Reader on the the Library Passage when selected.
It's hard to be more specific because I don't know exactly how you want your replacement Bootstrap based User Interface to look.