You've spent all that money on your phones and are bodging these docks, frankly they look awful.. why not just sell your old ones and spend a small amount on the new dock?
Some of us are forced to. I'm looking into doing it myself for a very simple reason.
There is no 3G iPhone compatible dock that also charges the Apple Bluetooth Headset (meh.. I like it better than the jawbone as it doesn't go around my ear. It sounds perfectly fine in my ear anyway) so I have to do some plastic hackery to get the new phone to fit properly.
If I could buy a new dock then I'd be ready to buy one, but no such luck.