RAID config is fine. The only step you are missing is driver related.
You didn't say which driver you were using, but this is the one you should start with:
ftp.dell.com/.../DELL_MULTI-DEVICE_A07_R211422.exe
You need to run it to extract the contents ... there should be 6 files. Those files can then be loaded onto a floppy disk and used at the F6 prompt. Since this method can be pretty flaky (and the USB utility is even worse), I would suggest using nLiteOS.com to integrate the driver into your installation media. SP2 media may be required for this latest driver.
Another option would be to use Dell's installation utility:
ftp.dell.com/.../cdu_1.6_core_173_A01.iso
You boot to this utility first, walk though the steps of the wizard, then insert your 2003 disc in when prompted. This WILL require SP2 media (nlite can be used to add SP's too). You mentioned the 2003 media as "DVD" ... if this is really a non-standard media, like DVD, then the installation utility will NOT work with it (must be a standard retail or OEM CD).