Since my post of February 27th, The difficulties in making your own Kindle cover, others have tried their hand at making covers for the K2. Two interesting ones use the Amazon cover as a base in order to make use of the hinge mechanism. One of these totally destroys the Amazon cover to remove the hinge and use it, and the other leaves it in place and glues new material over it. These may be found here and here. I wonder if there is a source for buying just the hinge.
Also, there is an interesting comment following my February 27th post. This one does not use the Amazon hinge.