I like your proposal, great first shot 
I just suggest to move tree things:
1) "System/Security/Trusted networks" and "system/security/password policy" could be in "system/configuration"
2) "Firewall/static routes" in system/configuration", since there's nothing about firewall 
3) "firewall/ips" in "tools"
And finally Management.. I sound too "poor"...
Cups is an app, and share can be a rules, so what do you thing to put theses two itens in "application" and users & groups in configuration.
I would like the Configuration/status at the top of all. and the tools nearer the system configuration...before Firewall.