I had the same issue. My replacement glass doesn't have "that little piece that separates the ambient light and the prox". So i used the idea from iPhone 4 proximity sensor not working after replacing BLACK GSM but instead of using electrical tape i used the black marker, painted on the glass similarly as it done on the original Apple glass. Did it several times so no light come through painted area. After that sensor's windows on replacement glass looks almost exactly as on original glass, and proximity sensor began to work.
No. Everything is showed correctly. This strip doesn't have to glue to metal, there are plastic spacers for it at the top of the LCD.
If you afraid the glass will be loose of the bezel then you can cut two thin stripes of another two sided tape and attach them to the bezel's plastic as an extra option.
I think, it would be easer if adhesive strips were cut in such a way that repairer can attach them not to the glass but directly to device.
No. Everything is showed correctly. This strip doesn't have to glue to metal, there are plastic spacers for it at the top of the LCD.
If you afraid the glass will be loose of the bezel then you can cut two thin stripes of another two sided tape and attach them to the bezel's plastic as an extra option.