Got myself one of these today. Actually, this one's not for me, but for a friend. Therefore I was extra nervous when handling the soldering iron (I suck!)
Took me about three hours to desolder and extend the LCD and buttons. I didn't manage to desolder the buttons so I had to piggyback the new ones. I guessed that it would be OK since the buttons don't send signals but rather sends them to GND. It worked perfectly (and I've got two sets of buttons!)
Now, I'll just have to find myself a nice, cheap LCD bezel and I'm good to go to punch this one into an Amiga 500!
Wish me luck!