When we saw photos a couple days ago, I noticed the seats for FoP are not connected to the floor, as seen in the image below from The DIS. I'm thinking if the platform your seat is on can tilt in different directions left/right and forward/back, certainly it can also go up/down.The platform that your seat sits on is Steel and Concrete. It does not move at all. Just your motorcycle seat. You can clearly see the platforms are fixed to the building in construction photos.
The platform directly under each seat doesn't look connected to the load floor at all in this pic: