Toshiaki_TakanoPerview3.png shows the preview and Toshiaki_TakanoZebra4.png shows the zebra view (All selected constraints are sketch curves, so no tangent/curvature continuity can apply. This is a quite simple model, and I am not sure why you would be interested in it).
However, there are a number of problems with your existing model. For example, Toshiaki_TakanoZebra3.png below shows the zebra view of two surfaces from your existing model. They are very bad. I wonder how you generated them?
Toshiaki_TakanoZebra5.png below shows the new surface generated by XNurbs (simply select six boundary edges and one internal edge). It is much better, and it also shows some problems with your boundary edges…
Before using the model for a real product, you may need to re-design them.