I've built several of the Kadet Mk II's. It's a great trainer and will fly on a plain bearing 40. A .46 plain bearing is the most it will need, and something like the .46 AX is too much power. Remember this is a 1980 vintage design that is the grand daddy to, but smaller than, the LT-40.

It also builds differently from the LT-40. The Mk II has printed fuselage sides you build the internal structure on, then join the sides together. It also doesn't have interlocking formers but that is no issue at all. IMHO, I consider the build more of a standard build and think the balsa structure is more robust in the long term, and easier to repair than some of the newer designs. I still have a Kadet Mk I kit sitting in the storage closet with a NIB OS .35 FP that may get built this winter if time and other projects permit, if that says anything about the design.

I vote for the Mk II, but I'm also an old kit and scratch builder at heart.

Hogflyer