The nurbs can only be attatched to each other, IF they are a "valid" nurbs-surface, which means that they have an uninterrupted surface-flow.
They canno be trimmed and they must have four sides, with the U and V direction.
But you could make a patch model. Making your surfaces consist of many four-sided-surfaces. But not with the surfaces you now have.
But that I know little about.
I do not support Bush! Nor Saddam! Long live UN!