Very nice find.
Check out some of my disassembly pics here -
http://geekhack.org/showwiki.php?title=Island:6580
These are easy enough to completely dismantle. First, remove all four screws on the back. Rest the keyboard on the ground with the keys facing down. Lower the feet on the keyboard, and then press the knobs in, and then lift the back of the keyboard up. When it's about to come apart, you will feel a creaking sensation as if something is about to snap or break, just keep pulling and it comes apart unharmed.
You're now looking at the back of the keyboard assembly. There's two screws holding into the top of the casing, and one holding down the grounding wire. Remove them. Remove the cable and LED wire from the controller (the connectors are keyed so you can't put the wrong ones in the wrong place when reassembling it). Lift the keyboard assembly out of the case. Remove
all of the keys with a flathead screwdriver, blunt knife or equivalent. Get two books, and space them apart so that you can support the assembly on them with the backplate facing up.
The backplate is secured to the upper part of the keyboard with interlocking tabs. One of these tabs, located over the F keys is different in that it folds over the backplate. Straighten it out with a pliers. Now, hold the keyboard at an angle against the ground (this works best with a carpet) such that the side that the keys went into is facing you, and the end with the F keys is the one against the floor. Push down on the backplate with your thumbs. (You can use a hammer instead if you want, but make sure you don't break something). When the slides unlock, grab both ends of it, and rest it on top of said books with the backplate facing upwards. Lift up the backplate, and tah-dah, you've disassembled them.
Reassembly is the same in reverse. The only caveat is the spacebar must be reinserted before you put the backplate back on due to the weird design of the stabilizer. When you insert the buckling spring on top of the space bar, it doesn't sit in place. Try and get it as best as possible, then slowly lower the backplate over it. Some use dental floss to hold it in place while reinserting it, I have never needed to resort to this though.
Speaking of that blasted spacebar stabilizer, it makes the spacebar very stiff (about 90g compared to the 60-65g for the rest of the keyboard). There's a means of making the space bar lighter, which is documented somewhere in the bowels of Geekhack. Basically, you remove the stabilizer wire from the housing. The thing when turned up the right way is a very wide V shape. Take the wire, rest it so that the bottom of the "V" is resting on your knee. Then pull down on the sides so that the wire starts to straighten out. You don't really have to over do it, just a little bit should be good enough to loosen it up.
Man, I've dismantled these things far many more times than is healthy.
