Don't know of a link, but it's pretty obvious what needs hacking when you open up the A1200. You'll need to remove the entire shield assembly in order to go to work and it's painful seeing the A1200 in several bits. But hey, all fun right?
No problems with the shielding removed. It's been gone for 6+ years now without issues.
Have no idea what that black thing is.
The old heavy A500 PSU's are great!
They have more current on the rails and I can safely say you'll have no power issues at all with 3.5" drives.