I built Ron's Rock-o-Plane model back in '98. Tricky?, YES! I couldn't get the box shape to the frame(wheel) of the ride, so i just built a regular looking Wheel shape out of it, and i powered it with a Faller motor, which was cool, but the cages weren't free-swing. I had them glued to the studs they would've pivoted on, had they been free-swing. So they got to go upside down anyway when it went around.[8D] As for the Paratrooper & Tilt-a-Whirl, never had those, but wanted to try out the Tilt-a-Whirl. That one scares me just looking at it...(building it). LOL [:0]
~Ben