The only
driver that I would consider integrating would be the storage
driver if required. Other
drivers, such as audio and graphics
drivers, are best installed after the installation of the OS, and I would place these in a folder called
Drivers so that they can be easily accessed (and updated when required, another reason for not integrating them as an update for these drivers would require a rebuild of the installation media if you are going to integrate them). Another folder to create would be Service Packs. All in all, I would set aside 8GB for this.
The rest of the stick (24GB) can be used for your own needs. I do, however, recommend to stick with 8GB sticks for this purpose, and only insert them if you are reinstalling, updating the drivers, or updating the service pack.