As far as the cabane struts I had the same problem but it did not affect anything. On the brackets not touching each other, that would definately cause a problem. It will either pull the screws loose from the wing when you tighten the bolt through the cabane strut or it will put sufficient stress on the bracket to cause them to break. If it were me I would put some washers between the brackets & solder or glue in place so as not to put any stress on the brackets when tightening the wing to the caban strut.
Hope this helps
Gil