Very nice review Tommyld! A harp guitar is a beast that takes some getting used to. I've had mine for over a year and I still feel like its a new experience, or maybe I'm a slow learner. ;-) A huge +1 on Gregg Miner's site:
http://www.harpguitars.net
There's such a wealth of information there gathered from so many sources. As for the Powell Brothers another +2! I talked to them before I did my custom build with Duane Noble and came close to going their way. I just really wanted a cutaway, and a fan fret, and a bevel... you know how it goes. But the Powell's are great folks who make a nice product at a very reasonable price.
Best of luck on your journey!
-jay