As for the comparison to the Kadet Mk II, the LT 40 is an easier / modern build.

I have built the Mk II and personally feel it is more building than most 'beginners' what to get into. not to mention it is a dated design, and retains a lot of the 'old time' building techniques. No real 'interlocking' tabs & slots and such.. A lot of cutting, carving, and sanding things to shape..