Forgot I built them together, and didn't bother to read my own text - ha. Those cables, on a D.III they're how the aileron works. One is fixed to the aileron, the other goes to the end of the little arm that pokes forward of the aileron - they work antagonistically. There's a cut out in the top wing for the arm. The hard part is marking where they come out of the lower wing. Expect to spend much quality time peering at fuzzy period photos.
The main trouble with the plastic is that it came out of the mould to soon, in one of my kits, so the sides slumped a bit. Hard to describe, but it means a lot of straightening of parts is needed. Good enough when it came out, but only just, and only because for a few days or weeks it was the only game in town. If one dropped on my head out of the sky I'd certainly build it because of the many paint-brushable (i.e. you can get by with generic decals) schemes, but I wouldn't go searching for one. As you can see, I failed quite miserably at refining the struts.
Scal Aircraft Conversions once did a strut set for the Roden kit, including undercarriage, and I tried one, but they're quite horrible. My set needed a lot of cleanup, and being soft metal it distorted even with care, then broke when being installed. I see they produce loads of sets for other aircraft, and I only hope they use a less malleable metal now (these builds were done in 2008)
Paul.