i seached on the FSM data base for sopwith camel and somewhere in there several people have had the same problem,but there was a post on how to paint plastic to make it look like wood...
after i tried it on a scrap piece ,i won't be needing the decals,it was simply amazing and super easy at the same time
paint the piece a sandy brown color,and then cover it with future.take a tube of burnt umber (oil) and brush it across(almost like a dry brushing) it won't go on smooth and leaves a great effect,i've only tried it on one small piece of scrap and got a good result,so i'm sure with a little practice i'll master a new found technique