First I made the Luna launcher. I used the 1/144 Vostok kit from Airfix to add some details to the Vostok stage as shown. I removed the upper part of the Vostok stage and added the Sputnik cone to it (see drawing).
After that I made the Vostok launcher. The worst problem was what to do with the aerodynamic shroud of the Vostok spacecraft. I decided to use the Voskhod conversion kit from Rho models (see drawing below). The result is much better.