Just repaired this tire and was wondering since it seems borderline.
http://i.cubeupload.com/ephXTU.jpg

What do you think about the sidewall proximity?
http://i.cubeupload.com/dVRzSE.jpg

I plugged it with a string tie from the outside.
http://i.cubeupload.com/QTSFM6.jpg

After cutting both sides flush, I patched it from the inside.
http://i.cubeupload.com/Pf9S1J.jpg

I accidentally got the rubber cement on the patch, but it seems to hold.
http://i.cubeupload.com/f260b6.jpg

The main question is whether the hole is too close to the sidewall.