I will also give you useful suggestions and ideas for your own dock , or a similar project .
I hope you can learn something new !
NOTE : This instructable is also appliable to almost any other iPod or iPhone model.
(I admit that I am not the first one to come up with this, and there are other similar docks out there, even out of Lego)
Step 1: Get Your Materials
iPod (or iPhone)
White dock adapter (supplied with your iDevice)
USB Cable (supplied with your iDevice)
Step 2: Fitting the Dock Adapter and the USB Cable
We need to make the opening on the dock adapter bigger , either by sanding it, cutting it with a sharp blade, or whatever method you can come up with.
You'll need about 1 mm extra space on each side.
See the final result in the second picture.
NOTE: If your USB Cable Connector has two release buttons , you have to sand off two little metallic clamps on the connector. Otherwise your iPod will be stuck in your dock. See http://www.instructables.com/id/Really-loud-DIY-iPod-Touch-Dock-with-speakers/step4/Dock-Adapter-and-AudioVideo-cable-edit/ for more info.
Step 3: Preparing to join the Adapter and Connector
Notice in the first picture that the wide side of the Adapter faces in the same direction as the back of the iPod.
Plug in the Connector of the USB Cable into your iPod.
Put everything as shown in the third pictue.
IMPORTANT : Make sure the iPod reaches the bottom of the Adapter, and that the Connector fits all the way into the iPod.