Ok, I'm nearing completion...
Just got my OCZ Vertex 3 120 GB SSD today. I was originally planning to install a RevoDrive SSD, but turns out you need one of the newer models (still expensive) to boot MacOS. So, went back to SATA III and got the nice and fast (and cheap!) Vertex 3...
I was going to install it in a standard Mac Pro hot swap bay -- but it doesn't quite work... Even though the Vertex came with a 3.5" adapter tray, the screw holes are not in a usable position. Also, the SATA port on the Vertex is not is a good location -- it doesn't line up at all with the drive tray.
So, to stop wasting time, I opted to use a thin neodymium magnet to just stick the thing to the side of the PSU. It is actually a convenient location - it doesn't displace anything else, conveniently located to power and easy to route/hide the SATA cable.
Also found a good way to mount my Bluetooth card and DC converter. I put some 3M "Dual Lock" (kinda like velcro) on the PCBs and mounted just above the motherboard.
Also had to change my heatsink choice. The Scythe Ninja 3 was my original choice, but it was just too damn big. It blocked one of the DIMM slots and made the fan mounting choice less than optimal...
So, I switched it for a Scythe Mugen. Fits much better.
The almost finished machine...
EDITED: 2012-07-04 - MobileMe is down forever... Had to re-point my images...