I agree with the above: very nice idea! And the kit really looks like a joy to build (from the box, I didn't start mine yet).
I am very keen on seeing your progress!
Masterbox offer some 1/35 WWI figures which are very nice. There's a set containing walking German prisoners with British guards. Two of them carry a wounded, but the third German looks quite similar to the guy on your photo:
Best wishes
Borsos