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Replace teapot object in Unity

It's been a little while since I've done this, so maybe I'm remembering it wrong.

I have the Image Target example working with Unity 5.3 and a Nexxus 5 Android phone. 

One of the image targets in the example scene has successfully been replaced by a custom target, and this works with the existing Teapot objects.

I would like to replace the teapot object with another 3D object. 

I have brought the object into the scene in Unity, and have placed it in the hierarchy of the Image Target I wish it to be associated with.  I thought that was all that was needed.  But this is not working. 

I can move around the teapots and re/disassociate them with targets.  But so far no luck with imported objects.

What am I missing?

I was able to use my own objects when I started a new project from scratch.  I do get an error when I use the 64 bit editor.  But the code seems to work the same.