Hi,
this might work only, if you get 32 Bit Vista drivers for your RAID controller to run with Vista PE.
Or add another disk to that machine, install Windows on that disk, install the WHS connector software and restore the backup to the RAID, which functions as secondary disk in this scenario.
This is described in the FAQ
How to restore a client PC, if the network connection does not work in the CD based restore environment.
Maybe you should learn also, that RAID0 gives only slightly more performance, but seriously increases the risk of a disk failure with total loss of a drive. Especially, since many recovery tools will have also trouble to help in such a situation.
Best greetings from Germany
Olaf