I think it would depend on the scale of Luftwaffe use and I am sceptical about the unsubstantiated claim of 400-500 in the IL2 thread. If there were indeed several squadrons of DC-3s flying around for an extended period then maybe, but if it was just a handful of requisitioned ex-airline aircraft then no. Wehrmacht T-34s are allowed as skins by HTC as there is good evidence they were used in the hundreds by the Germans but individual captured vehicles and aircraft are not.
Even if proof of widespread Luftwaffe DC-3 use was found I'd want to skin one with proper Luftwaffe markings (like the profile of NA+LC) rather than with civil codes like D-ARPD. I'd need a photo of such an aircraft if I were to do it as an MA skin.
