He is a Private - no stripes. Probably taken at home before he left. If that is a steel helmet on his pack it will be the 1915 model, but it did not reach the troops until early 1916. Have you found his medal card/papers? If not, post his name, place of birth and age. If he didn't lie about his age he would not have been sent overseas until he was 19.
Overlapping boards on stone blocks usually equals a hut in a training camp.
Ken