XP install on mixed hard/soft RAID - Thoughts?

Hi. I'm hunting around on the web for this, but I can't find much, so I'm wondering if it's more complicated than I'm thinking.

I'm trying to install XP on a Dell. I've got:

2 x 36G SCSI drives on onboard SCSI bus.

2 x 18G SCSI drives on PCI RAID card configured as Raid-0.
(so this looks like 1 x 36G SCSI drive)

So all this looks like three 36G drives.

I want to run software RAID-5 on these three, which will become the XP boot disk.

THE PLAN:

I thought I might:

(1) Use the setup disk to install XP on an onboard ATA disk.
(2) Install the SCSI drives on another machine with 2K3, create a RAID-5 dynamic disk, and then reinstall the drives into the Dell.
(2') (Or use the XP Raid hack to make RAID available and then set up the 3 SCSI drives as a single RAID-5 dynamic disk - but that might be considered illegal.)
(3) Copy all files from the ATA disk over to the RAID disk.
(4) ?? How do I set the MBR on the RAID disk ??

I thought <<maybe>> I could use Bart-PE to do (4), but I'm not sure about that and I certainly don't know what I need to know about the MBR to make it work.

Any thoughts? Input would be greatly appreciated.

Thanks in advance!

I suppose I could, though even then XP doesn't support RAID (unless it's in hardware), so I'd have to figure out how to get the files over there and set the MBR.

Thing is, I could buy another computer too, but then what would I learn about Bart-PE and MBRs??

you can set software raid through disk management.