However, like Saktoth says, all of these deviate in no way design wise from their OTA counterparts.
How about a creative challenge? Design and model something that would function like a solar collector, but would be animated fundamentally differently from both the OTA solar and the Adv solar.
I can give a suggestion (but people will probably shout me down

Sortof like this popular "steaming tray" design (except the cone would be where the center rod is):

And when folded:
