Thanks for pointing out the power issue, that's another aspect I have to keep in mind. Unfortunately I wasn't able to open up the server at the time that I was around it, but Snap tech specs say that there's a 250 Watt PS in there. Maxtor has the drive power peeking at about 30 Watts per drive (at spinup), so if there really is a 250er in there, I should be good.
I'm also going to try and see if there are higher cfm fans that I can throw in there, just to help dissipate some of the heat a little bit better.
The big date has been set for this Sunday, so I can work on it uninterrupted...and so no one will be around to see me
if it fails.