Q:Why are some/all props displaying as lods?
A:No idea. The decompiled version doesn't show anything indicating props have their lod properties overridden. Probably the guy who originally compiled the map was a noob.
Q:What's the origin of this map?
A:It's from an old cinema server called PonyTheater.
Q:Copyright?
A:Who gives a crap. None of the assets or artwork apart from Valve's default assets were used with proper permissions anyway. I don't respect the people who owned/owns PonyTheater anymore to give them a shoutout. Especially when they ban me from the new server not even giving me a thanks for this being posted.
Q:Why is there a lot of missing clipping or brushes in general?
A:I'm not the person who made this map as mentioned above however I could give you a few possible reasons.

• The server at the time had no easy way to get out of bounds thus it wasn't important.
  
• This version could have been a work in progress so a future map update could have been planned regarding that.

Q:reeeskin
A:Take a look at the Hammer overviews assmunch. No idea why you whine about this when the entire workshop is crammed with reskins. Go reee elsewhere.