Second, only initial acceleration is needed to make you think you're moving continuously if the screen shows continuous movement. Third, only a fraction of the angular tilt is necessary to make you think you're facing straight up or down. Notice when you are in the amusement park or mall simulators and you think you're looking straight down. Then notice when you're outside watching it, it really only tilts a fraction of this angle. Which brings up an interesting observation.
Composites are expensive.
Steel is like corn flakes, try it again for the first time. Cheap, easy to weld and it gets stronger with each flex. Allow for movement as weld cools. Anyway, you get the idea. Of course, as an out, there are abrasive discs and hand grinders to cut welds and redo them.