You can Use a Prog Called N-lite to build your own custom one this one loads the drivers in the i386 file that you specify you could change the contents
nLite Features
- Service Pack Integration
- Component Removal
- Unattended Setup -this means you pop in the cd hit any key and come back to a fully installed OS
- Driver Integration *
- Hotfixes Integration **
- Tweaks
- Patches ***
- Bootable ISO creation
* - Textmode (CD Boot) and normal PnP
** - only new type 1 hotfixes (for example XP post SP2)
***- supports generic SFC, Uxtheme, TcpIp and Usb Polling patching.
nlite can be downloaded here
http://nuhi.msfn.org/nlite.html However the holygrail of what your actually lookijng to do is windows embedded so its great that they have a trial download--http://www.microsoft.com/downloads/details.aspx?familyid=dacd1722-256b-48c5-91c1-af6062340efc&displaylang=en