Help with Unattended IIS 6 install

[Harrisment]

I'm playing around with creating an unattended install for IIS. This is just for IIS, the OS install will be handled by a seperate group and will be done by the time the server is handed over to me. Everything is working great except I have a .cmd file that I want to run at the end of the unattend file located in the [GUIRUNONCE] section, and it's not kicking off. I've just been told that the GUIRUNONCE is only valid when doing a full OS unattended install. Is there anything similar I can use in this scenario to run this file? I'd like for this file to run automatically once the IIS install completes. Here is my unattend.txt file for reference:

[setupMgr]

DistFolder=E:\i386

[Components]

aspnet=on

complusnetwork=on

dtcnetwork=on

bitsserverextensionisapi=off

iis_common=on

iis_ftp=on

fp_extensions=off

iis_inetmer=on

iis_nntp=off

iis_smtp=off

iis_asp=on

iis_internetdataconnector=off

sakit_web=off

tswebclient=off

iis_serversideincludes=off

iis_webdav=off

iis_www=on

appsrv_console=off

inetprint=off

[internetServer]

PathFTPRoot=D:\Inetpub\FtpRoot

PathWWWRoot=D:\Inetpub\wwwroot

[GUIRunOnce]

"W:\W2k3-IIS-Unattend.cmd"

The W:\ drive is mapped to a remote location, but I've also tried copying the .cmd file down locally and changing the file to point to the C:\, but that still doesn't work. Another odd problem is that during the unattended IIS install, it will prompt me for files on D:\I386, and I will manually have to point it to E:\I386 (which is the cd rom.)