I'm not sure about the "Skylark" part, but I was flying Thunder Tiger Arfs in the late 80's. Your 40s should be a "Shoulder Wing". They made a 40T, which was a trainer, a 40L, which was low wing, and a 40S, which a shoulder wing. Shoulder wing means the wing was on top of the fuselage, but there was no Cabin. Never really liked shoulder wings. Had Ts and Ls. They balanced perfectly with the light OS engine, the FP. Today's example is the LA. You can put a heavy engine on it, like the AX or clones, but then need some small amount of lead in the tail.

They were all good flying planes.

Ken