I am not certain you can do this. The reason for those dbs is so very important
Purpose - Core system database to manage the SQL Server instance. In SQL Server 2005, the Master database is the logical repository for the system objects residing in the sys schema. In SQL Server 2000 and previous editions of SQL Server, the Master database physically stored all of the system objects.
Per instance configurations
Databases residing on the instance
Files for each database
Purpose - The Resource database is responsible for physically storing all of the SQL Server 2005 system objects. This database has been created to improve the upgrade and rollback of SQL Server system objects with the ability to overwrite only this database.
System object definition
Introduced in SQL Server 2005 to help manage the upgrade and rollback of system objects Prior to SQL Server 2005 the system related data was stored in the master database Read-only database that is not accessible via the SQL Server 2005 tool set The database ID for the Resource database is 32767 The Resource database does not have an entry in master.sys.databases
Model Purpose - Template database for all user defined databases Prominent Functionality Objects Columns Users Additional Information User defined tables, stored procedures, user defined data types, etc can be created in the Model database and will exist in all future user defined databases The database configurations such as the recovery model for the Model database are applied to future user defined databases
Purpose - Primary database to manage the SQL Server Agent configurations Prominent Functionality SQL Server Agent Jobs, Operators and Alerts DTS Package storage in SQL Server 7.0 and 2000 SSIS Package storage in SQL Server 2005 Additional Information Provides some of the configurations for the SQL Server Agent service For the SQL Server 2005 Express edition installations, even though the SQL Server Agent service does not exist, the instance still has the MSDB database