1) ok
2) you'll need to "hardcode" it, call it at the bottom of every article... it's a visible element/anchor and you can't pull it in any other way that I can think of...
<a href="#" id="gantry-totop" rel="nofollow" style="outline: none;"><span class="icon-angle-up"></span></a>
//you'll need to define the "icon-angle-up" class if you want the little carrot ^ in there (FA icon)
3) some parts of some module class suffixes may work... you just have to play with them... often times though they target sub-selectors of the main module wrap like rt-block and module-surround to add borders, margins, padding... so in those instances, no, they won't transfer over well