You said it yourself but maybe it's good to hear it from others, too: This looks an awful lot like dm_lockdown

No matter if you build those brushes yourself or not. Maybe you should have copied some to save time.
But, honestly, brushwork looks fine, layout very open but ok. You understood the lockdown lighting which is important for me. Use your skillz for something more unique, theme-wise, for your next map.
Nice!