Update:
The little guy has rebounded pretty well today. He's started building a burrow and seems much more comfortable, but still extremely shy. He's quite a comical fish to watch.
Here's the finished tank--I still have to notch some plexi around the plumbing to make a better lid (it's kind of rigged together now). I'm gonna leave the light off for a while to get him to feel more comfortable. I'll probably end up putting another piece of live rock or 2 in there.

This is the best pic I've been able to take of the fish so far (I can't get very close):
Maybe I should have this thread moved to the Nano build off...can you do this for me Jeff?