Holy christ you really destroyed the scree! Nice work :-) I just installed a very similar part yesterday and it's been working fine. One of the screws holding down the battery cable was super tight and I came close to stripping it out. Also when I reassembled it seems like I didn't have one end of the antenna coax cable tight, so the bars would drop to zero and the phone would red-light-shutdown.

This video was the most helpful of the few that I found on YouTube. I would also recommend getting a very small flathead screwdriver which will assist in unlatching some of the clips/cables.