You can measure and eyeball everything down to the millimeter, and it will look "just right", but the first time it breaks ground it may be all over the place. Some trim will inevitably be needed, and even though you might not DO much straight and level flight, the plane should be trimmed so that it will fly straight and level "hands off". For instance, with the Kadet in particular, the flat bottom wing will make it power sensitive, and at a given airspeed, it may fly level; bump up the throttle, though, and it will want to climb unless you re-trim the elevator (put a little "down" in) for level flight at the higher airspeed. My recommendation is to trim it for a slower airspeed, and get used to how it handles, and get used to how the sticks feel. You may be able to fly at higher power settings with that trim, but just "lean on" the elevator control to keep it level, just as you will have to "lean on" the ailerons to keep it level when you fly in a crosswind, even though it's trimmed for level flight. The Kadet MkII was my 1st plane, and it is a good trainer, fairly tough. It has a fairly short tail moment and turns quickly, so it may feel a bit "twitchy" at first