This is a great idea for a thread.
I have no idea about dimensions though. So big. That's all I can tell you.
I want the entire collection on display, with emphasis on the things with sentimental value. Like my orginal set of lps that my dad gave me. It wouldn't be just Zeppelin though, I'd have a space set aside for Janis.
My system now would work, it's Pioneer. Turntable, 25 disc changer, equalizer, the power box. The speakers are probably about 3 feet tall. If it was possible I'd like a working and LOUD vintage system to complete the theme of the room. And a reel-to-reel player.
A large flat screen tv with a dvd player for showings of footage. I'd go surround sound.
My music itself would be stored like the following:
Vinyl in old wine crates
CD in those rotating cases
Bootlegs on shelf to be displayed
Blacklights and lava lamps are mandatory.
Hardwood floor because I have a tendency to spill things so no carpet would be nice.
People could come visit me but no partying because if you broke something I'd be after you.
Oh yeah, and a computer for research and talking here.
Unless you mean in the 70s when the boys were in their prime then I have a totally different idea.