Hi:
On the tail first, the whole horizontal stab moves up and down. And on the wings, what is the holes on top of them, is there some sort of screw or bolts in them. They are in line with the wing rods, that be the way it stays together. When I flew my second sailplane it was a Airtronics Aquila and the instructions says to insert the wing rods in a orange over night, that would make the metal rust or something, so when I put the wings together they wouldn't come apart very easy, It is a Thermal mostly, but I think it can slope also. I never done slope. And on the design of plane, I haven't got a clue who makes it. But someone here will tell you.