I built the TF 60 P-47 and added the panel lines and rivets. Honestly it only added maybe a few days to the total build. Panel lines are easy, took all of 1 day to lay the chart pack tape out, spray the primer then wet sand the next day. Rivets, maybe another day or two max.....it really doesn't take as long as you might think. Makes it worth it when just one person comes up and knows what I put into it..
Some people still ask me though "Who makes that ARF?" I should start saying "Nitro Planes".
Gary