Now I've got everything but the motherboard, and that's supposed to arrive tomorrow (via UPS). I'll have the system together and installing Gentoo before I go to bed tomorrow night - assuming I can find a place to put it. The Antec Titan 550 case is, indeed, large. I went ahead and put the drives in it, and found something strange: Drive rails. Who uses drive rails? Those went out with high-button greaves, to quote Bored of the Rings. Nevertheless, there they were.
It's as together as I can get it without the motherboard - which isn't very together. Hopefully, it'll go together the rest of the way quickly; since all I'll have to do is install the motherboard in the chassis, then add both processors, memory, and cheap video card, there's not a lot to get in the way.
I'm not real impressed with AMD's retail packaging. They use a recycled paper carrier, like the stuff used to make egg cartons, but it's just not sturdy enough for the heavy heatsink/fan. The one I opened up was cracked, and little pieces of shredded paper were everywhere. I'm going to have to blow it out with some canned air before I put it in the case.
I'm looking forward to starting in on that project. I think Hercules will run quite well on that box.