Any ideas for integrating a stereo system into MCM crib?  

HIDE IT ALL!!!
Closet or cabinet with an RF remote control then in-wall/in-ceiling speakers. The only thing visible is the display.

it depends
Tulipman,
Should any of your "vintage stereo" pieces happen to be McIntosh tube amplifiers do not hide them, as they are a 1906's vintage look.

Paul laszlo radio cabinet
Brown saltman manufactured just the thing for you.
http://revolvervintage.com/blog/paul-laszlo-for-brownsaltman-by-way-of-g...

I have mine in a wall hung unit
It's not mid-century, but it hides everything (My living room is modern/victorian/MCM!).
You could easily install a new powerpoint and use a PS system wall-hung cabinet?

I have mine all tucked up in ...
I have mine all tucked up in a walnut Barzilay cabinet I picked up a couple of years back. I like it, but it is huge and heavy. There is a pull out turntable drawer behind one of tambour doors.

I like the look of these, too:
I like the look of these, too:
http://www.dwr.com/category/storage/collections/line.do

There are TONS of midcentury...
There are TONS of midcentury style audio racks and cabinets. In the late 50's to mid 60's audio was king. It was the new thing, and everyone had a system. Most all of it is midcentury modern. Just browse CL for one. I am an audio nut, so my system is housed in an open teak media center from the 60's.

Sadly the days of big floor standing speakers are behind me.
I do like the way an amp and cd player fit perfectly into the under-tier of a Peter Hvidt & Orla Molgaard Nielsen coffee taable.
I fucking hate wires!

...
This simple teck module, although recent is in two pieces and can be put in many combinations (and can be easily be done out of scratch) , don't know were it comes from, (probably indonesian) but I'ts great for my Bang & Olufsen stuff...
I also have this Ste-Marie & Laurent chrome credenza from the 70's (André Laurent, Montréal) which is great... (I've put a tv on that before...) but the speakers kills the look somewhat....

B&O fan
hamacbleu,
Nice system.
I too am a Bang Olufsen fan. I like the Jacob Jenson, BeoMaster and BeoGram (CD and turntable) 5500, 6500 and 7500 pieces. The crowning touch is the David Lewis, BeoLink 7000 remote control. This was the most difficult component to locate. For me, this is a secondary set for the bedroom.

Beolink 7000
....I wonder if anyone can find a better looking remote control than this....
Yes I'm a B&O passionate...In fact I recently let go of my MCM passion recently for these things. Anyway, jacob Jensen design fits into MCM. It was futuristic at the time, but always done with taste... And what I see is that David Lewis 90's design, goes into that category too... even 20 years later
By the way, regarding the OP, B&O did produce beautiful nice cabinet in the 70's for their stuff, all veneered in real wood, and in many dimensions...(see the link below)I would definitely exchange my too expensive indonesian teck module for that....
http://beophile.com/?page_id=11142

hamacbleu,
I know this...
hamacbleu,
I know this piece. Very vice. Their CD racks are also decent
While Bamg Olufsen audio equipment is not of the quality of McIntosh (my primary system) it does perform well and looks great.
All this stuff pops up from time to time at reasonable pricing. When I found a pair of Jacob Jensen, Form 1 headphones for $100.00 (new and unused) I could not say no. Last May I bought a pair of near mint David Lewis, Beovox Redline 140 speakers type 6501 for $50.00. Enjoy your collection and happy hunting.

niceguy,
that's very funny. I also have the complete 6500 system with RL-140s (ebay, 30? lol) in my living-room. the design is very unobtrusive, especially if you place the components next to each other.
still looking for a 7000 remote but I also like my MCP 6500...

You guys with your
wires hanging out all over the place:
Get one of those shallow picture ledge shelf things and cut a hole in it somewhere that is big enough for one plug to to through.
Mount it on the wall behind your unit of choice, about 5-6" lower than the top surface (or whatever height works best, once you see where I'm going with this). Just don't block the nearest wall outlet.
Place a power strip on the ledge and thread the power cord through the hole that you cut and plug it in.
Move the unit into place and arrange your equipment (shut up! you know what I mean) on it. Bundle cords and secure with twisties so that there's just enough length left to plug into the power strip.
It's probably a good idea to label each cord before you bundle them because it can get a little confusing back there if you have a lot of different things plugged into the power strip.
End: only ONE cord showing. Or none if your wall outlet is in the right spot.
You're welcome.