You have the opposite problem that I have
I got the motherboard and nothing else!
Luckily I found a cheap case and power supply on Ebay, and I happened to have an X5472 collecting dust. If everything goes together and works I'll have a T7400 for about $250 after shipping. I should still probably pick up one of those ridiculous CPU heatsinks though, instead of this 1u heatsink I have from an Apple Xserve.