Adding abstract models to the scences

Hi Guys,

We are planning to develop an AR game with my friend, which will allow users to create, design and publish their own characters. We want to use Unity for the project as it is the easiest solution.

So with that perspective, how can I add abstract (not pre-designed) models to the scenes using vuforia plane detection AR scenes?

Also, how we can design a studio-like portal for designing or 3D-scan models into the game directly?

actually we also want to add some features to add some properties which is quite like what wikitude offers; like being able to detect the plane as a vertical plane and adjusting the object into the plane.

I would be really pleased if someone can answer those questions. We are quite lost at this point.