OK, the more astute among you may have noticed that case was going to be a problem.
Not only is the power supply wrong (an issue I had planned to address with an adaptor ), but, as enormous as it is, it's too small for the mainboard. The Tyan Thunder K8WE is a freakishly large 12"×13", requiring the new SSI EEB 3.5 case size, and an EPS power supply, the pair of which could easily cost me $800. Not having that kind of cash, I am now casting about for a reasonably priced, attractive, non-rack-mount case with a useable (preferrably modular) PSU. Here are a few suggested by Tyan: