Ohhhh, just had a thought looking at your mess of wires picture.
You mention one can run 2 2.5" form factor drives. That means that there are two SATA ports available to you. One will be SATA port 0 to which you are supposed to hook up your boot drive. The second will be SATA port 1.
Thus, you can hook up your hdd externally with a longer SATA data cable, and your ssd also externally with another longer SATA data cable. Then boot off the Acronis CD and you should be good to go. You'd need two of those external drive power supplies this way. You might even be able to fit the 3.5" inside and snake a longer second SATA data cable outside and get by with your one external power supply.
