The SIG Senior is a great plane but an old design, SIG Kadet LT-40 is a lot more up to date will laser cut as well as dye cut parts. The fuselage is plywood with a plywood doubler. The wings have a spruce main spars. Grqanted some people don't like wire landing gear but you want that on a trainer to absorb some of the force of a hard landing. Also the LT-40 has the tank, wheels, etc, needed to build the model. You provide your own glue, radio, engine and covering material (3 rolls of Monocoate in a single color will do). You won't need to buy anything else.