I believe there is some pics in usmcbutler's build diary with the glass version installed
A lot of people go for the flat lens but they usually have a black outline around it where it mounts. It all depends if you're happy with how it looks in your build, also your budget and patience I guess.
Not sure what you mean by the edge of the lens, the base of the lens goes below the body. In that picture he posted it's a negative (mould) of the lens or it's upside down, however you want to look at it.