I appreciate getting a response, Old Toad, but I should further clarify my question.
I'm asking how an administrator can modify or create a custom template for the guest account.
The guest account defaults to a dock full of about 20 apps that Apple crams in which is completely inappropriate for our public library use case.
A custom template for the guest account would be ideal but I'm not finding any effective way to create this.
For now I'm trying an alternative approach which is to create a Standard User account but provide a script which deletes user data on Log Out - which is the feature of Guest accounts which is so desirable for privacy in a public setting like this.
Any suggestions for either option, custom Guest account or self-deleting Standard account, would be greatly appreciated.