Board Thread:Support Requests - Getting Technical/@comment-6548012-20151202163935/@comment-856287-20151202174410

I'm pretty sure forcing all of Wikia's widgets down to place your infobox in the right rail would not be allowed, although it would be trivial to cause infoboxes to appear in Wikia's right rail (the sidebar). The only place you're allowed to create a custom "right rail" is on the wiki's home page (and Wikia provides code/tags/help pages to make that happen easily).

One alternative: you could try making most of the infobox collapsed by default, so users can expand them as needed.