That setup is very convoluted! The best thing to do if you want Win-8 Preview on the SSD, is to disconnect all the drives except the SSD, and the DVD drive, and using a Custom install, remove all partitions from the SSD drive leaving it all Unallocated space.
Then with no other HDD's attached, install Win-8 onto the SSD. It will place the 100MB system reserved active system partition first, then make the SSD the C: drive as the boot, crashdump and pagefile partition. All will work perfectly. When done, make the SSD the "first boot drive" in the BIOS.
You can then use any of the other drives as a data drive E:
When you are done with Win-8, or decide to update to the RTM version, you can do that on the SSD, or just delete everything on the SSD and the other drives will work as they do now.
It is much better to have the system reserved partition on the same Disk as the C: drive.