Hello,
Use Content Center in Assemblies it is a good idea, because standard parts used all engineers in the world. But, very offend when a project can not opened because user did not properly collect project files and forgot standard parts.
I suggest forming SQL-request in assemble file for a inserting standard parts in assemblies file. This request will allow you to create standard parts that are used in this project during the assembly opening.
Naturally, that it will be working for the standard parts which was in Content Center.
PS: I know about existence Vault Professional, I want it will be working in the for the single users.