Nice work! You even have multimarker support working.
I tried to implement ar in the past but never got anything to work (i didn't use ARKit but the one that comes with the book "Augmented Reality: A practical approach").
If you ever get this working nicely, you already have a buyer. I've been looking for an easy non-flash AR solution for ages now.
Keep us updated!

[edit] Is this OpenGL based as the ARToolKit or do you use A7's native dx renderer?