The clustered indexes you chose for ClientOrder and ClientLine are not ever-increasing so you will incur page splits as clients add orders to existing pages, which is not going to be ideal in many cases depending on the workload. Choosing a clustering key is fundamental if you hope to produce a well-performing database that is maintainable. Please read this article and all linked articles:

http://www.sqlskills.com/blogs/kimberly/more-considerations-for-the-clustering-key-the-clustered-index-debate-continues