Not had a look at the scene, but the box in the pattern geometry should be the crop box - it cuts out what parts of the geometry will be repeated. When modeling some geometry for a pattern, to ensure everything aligns perfectly, it's usually best to make the pattern geometry larger than you need, that is, it already repeats. Then you cut out the smaller part that represents just one repeat.
On the second item, in Corona if something can be mapped, it either takes its value from the number, OR from the map. If there is a map plugged in, the number is ignored (it does not multiply or add with the map, but gets entirely replaced).
Hope this helps!