You could changet things that are obvious and visible.. the main gear... turn the stab/elevator into a fully flying verions and fix the tailwheel up. That would go a long way. Addiing wing warping... or easier make strip ailerons with the groove facing downard.. hinging at the top. This would better hide the aileraons on the wing giving an illusion of wing twisting. Or better still use film for your hinges. Run the top covering back to the stripi aileron in one piece and apply a second piece underneath.

The eindecker is on my list and I have several ideas on how to bash in some wiing warping along with other mods to take the stock kit to a more scale like appearance and function.