Hey, about 5 months ago I was going to do the same thing you just talked about. That is, running a snake eithe over the control room wall, or through a hole in the wall, but then I realized that I would be putting to waste my beautiful 2 foot thick wall.
I'm have certain advantages in the department of running wires and stuff like that, I'm an electronics technician so it's all part of my job to do that kind of stuff. Doing it in my own home is just like on the job.
The last reply had it going on, about the "tunnel" but it's really called Conduit. If you go to any hardware store and as for 1 1/4 inch PVC conduit they'll be able to help you out. What you do is: Make a small enough hole, either in the ceiling right next to the control room wall, or run the conduit to the floor inside the control room and cut a small enough hole at the bottom of the wall. Conduit PVC is EASY as pie to put together, you just need the adhesive to glue it. There are also special 90 degree fittings that make pulling the wires through it a BREEZE. Figure out how many bends, or turns, there will be and buy that many 90 degree fittings. It's all SO easy to do. And the reason I said to use 1 1/4 inch conduit is because you'll be able to fit plenty of wires through. And the nice thing about running conduit and leaving the ends open once construction is complete is the fact that you're completely open to pull as many wires through as you want, whenever you want, and there's no pressure to get that part done before everything else. As long as you keep the ends open you'll be ALL good.
Now you're probably asking, "how do you actualy feed the wires through the conduit?" You use something called a Fish Tape. I know I know, it's a funny name, but if you go to the hardware store and ask for a 50 foot Fish Tape they'll know exactly what it is, and it will run about $25, well worth it to do it all right. The Fish Tape is a long metal "wire" that can go through the conduit no problem, you just push it through (try pushing a flimsy wire through the conduit). Then when the Fish Tape comes out the other end, tape all the wires you want to it using electricle tape and pull them on through. It's so easy you'll think you just won $100!
With those wires you can buy boxes and mic ends and solder them yourself and put it all together yourself.
The bottom line as to why you want to run conduit and not use a pre made snake is this... What if you want a bigger mixing board some day?
The reason big studios have BIG mixing boards isn't because they're actualy using 128 channels all at once, it's because they've got 10 rooms, all with 20 something mic jacks in them.
I hope I was a help to you
