Hi Lewis, I don't know why your mirror was off, I'd need to see the model right before the mirror to be able to tell you what happened there.

Some pieces seem to be off by just a very small amount around 0.002 units, which can be problematic since it's right around the join tolerance.

You can't edit the control points of edges like you can in LightWave - edges are markers that live on surfaces, it's the "underlying surface" that you can edit control points for.

I think I've located one spot that may be causing the most trouble, I'll e-mail more info to you after I've seen if I can repair it.

- Michael