Update July 2012
Now that we can edit posts regardless of how old they are I thought I would post a few updates here for people looking to build one of these and compile some past posts since I get PMs about it every one in a while. Please read through this thread and post any questions in here before PMing me, I will see your post I promise. I will be happy to answer any questions in this thread and if you plan to do it differently then it's best to plan it out carefully but my build works very well and is very sturdy.
This is a pretty easy DIY project but you will need some basic skills and tools and be able to figure some things out on your own- if you need a list of every single screw and washer I used and step by step instructions this project is probably not for you.
Here is the full parts list I used in my build- all parts are picked out specifically for the dual expedit configuration I used so keep that in mind if you are going to modify it you need to check if it will work:
Two 2x8 expedits: $140 http://www.ikea.com/us/en/catalog/products/10103088/
3 lillangen leg frames $25 each for $75 (must be this exact model for the correct width of two expedits: http://www.ikea.com/us/en/catalog/products/40205194/)
4 godmorgon legs: http://www.ikea.com/us/en/catalog/products/10177767/ $8 each for $32 total
You may be able to get away with two depending on what you use for a monitor stand to mount on top, but the second set is to get another mounting bracket/screw to make a straight stand that you can bolt and screw a piece of plywood into
you will need top plates for the monitor stand, I had two spare ones from some floor monitor stands I just screwed in. You could screw into a shelf (preferably not the cheap hollow lack) or just a piece of wood from lowes spray painted might be easier and what I would do if I didn't have the metal plates. These are the metal plates I used from these stands: http://www.amazon.com/OnStage-SMS600.../dp/B000CD3QYM
Optional: 3x dioder light kits http://www.ikea.com/us/en/catalog/products/50192365/ $120. You can use fewer depending on how you want to light it
2x capita brackets http://www.ikea.com/us/en/catalog/products/40051196/ $15
From lowes/home depot: you can get nice 1/2"x12" by however long wood you want your shelf and they can cut it to the length of the shelf and you can spray paint or stain it. This is better than using an ikea shelf since you need to screw into it. You can use this for monitor stands too.
You will need two long metric bolts and large washers for the capita brackets. These are the exact bolts I used from Lowes: http://www.lowes.com/pd_214487-37672...RL=&facetInfo=
M10-1.50 x 75
You will then need some long thin bolts to bolt the godmorgon legs through the expedit with some fat 1" diameter washers for each bolt. I had to enlarge each hole on the bracket slightly. Don't try to screw these in they need to be bolted through with big washers. I forget the exact bolts I used but go to the store and shop around a bit and look through the pictures in here.
Then you will just need misc screws to secure the leg frame and some drill bits and such. you will also want some brackets to secure the expedits together (again, look at the pictures)
Also the headphone hooks from Ikea which are awesome: http://www.ikea.com/us/en/catalog/products/60152590/
Here are some pictures I took a couple months ago from when I rearranged my apartment and moved the booth which gives you some more details on how it was put together since I didn't take as many pics as I could have when I put it together (it also held up perfectly fine moving it by myself sliding it on it's side on the floor and then turning it back upright from on it's side with all the weight on the legs, though it was a pain in the ass doing it alone).
I drilled a bunch of extra holes in the leg frames to mount it better just to make sure they are sturdy, it is easy to drill though and I don't think there are enough holes if you just use the stock ones.
Here are some more posts in this thread with more in progress pictures (keep in mind some of the stuff like the lack shelves didn't get used in the final design):
I saw a couple ideas for things hacked together from ikea parts but I don't really have a table saw or tools at my new place so I want something with minimal cutting.
Basically I need to fit two technics, s4 in flight case, mpk49, ipad, maybe an apc40, maschine, and 2 x1's (though some of those can stay stored away) and maybe some storage space for vinyl underneath but I have other spots for that too. I have monitor stands made of pipe I can bolt onto whatever I do.
So I would love to see some idea.