I finally worked again on this project and removed the arduino. The servo is now directly controlled by the ESP8266. The 433MHz Transmitter was also removed, becasue I noticed that I don't use it yet.
To be able to mount circuit on to the servo, I sandwiched all the necessary components between the ESP and a perfboard.

To control the ESP, I used nodemcu and I plan to opensource my code on Github. A link will follow soon.