When you say "I noticed according to the plans that the rods that go to the aelirons and flaps do not go into the fuselage"

this is not unusual all it means is you have 1 servo per control surface mounted under the wing ie. 1 for right ron, 1 for right flap, 1 for left flap 1 for left ron. The leads for the 2 rons and the 2 flaps are than joined via a Y lead (ron/ron, flap/flap).

a lot of earlier rc kits were adaptions of earlier free flight or control line kits and could be built as either depending on your build skills what you could aford