Congratulations the Kadet Senior is likely the most kit bashed airplane ever and in a hugh variety.

Suggest you go with the 91 sized four stroke if you stay with one engine and if you are working from the kit as opposed to the Arf (the Arf comes with them and the kit does not) then do consider adding . If adding ailerons do reduce dihedral to about have that shown on the plane.

Here is my kit bashed Senior going on six years old now and something over two hundred flights:

John