An inexpensive modification that gives an RV a more polished look are using prefabricated rudder cable fairings on the empennage. You can get a set from Aircraft Spruce for under $20.
Installation is extremely easy, Suggest doing the drilling and initial match drilling/dimpling when working the skins. Once you get to the routing cable step you'll easily be able to buck these on. You can shape them a bit if want or leave them as is. It may have taken me 20 mins to do all the prep work.