rUnits seems to be a pretty old fork of oUF, I would suggest you merge the newest version with your own fork, the new version supports stand-alone layouts, much better aura handling, default but user movable frames and is a lot lighter.
oUF - Unit frame framework for the people. Does nothing by itself.
There's also a bunch of other very minimal addons on the same git.
(note: I'm not haste but I've worked a bit on the newest oUF with him)