From what I've been able to research online a Rails::Engine would allow me to mimic the Rails paths. I figured this would allow me to include everything just by placing them in the equivalent directories. As I have found the directories aren't loading the assets or helpers. I have not mounted the Rails Engine nor isolated it as I want everything to be included locally. It won't interfere with the namespace.
I would prefer a Railtie, but I am unaware of howto add a JavaScript file to the asset pipeline, and a partial to the view. But I can get a helper method working with a Railtie.
So the question is basically howto include JavaScript, and ERB partial, and a helper via a gem. Not curious at all about gem building, I know that. And I'm not concerned about rendering a partial from a helper method. Just need to know how to include the appropriate assets/partials so that they load with whatever Rails application which requires the gem.
I have since completed a project with all that I've described here. Feel free to use the source as a template for completing your own projects.