Hardware-wise, the industry has moved from hydraulic to electric motion jacks. It's great if you can avoid pumping high pressure hydraulic fluid. You want to t

Hardware-wise, the industry has moved from hydraulic to electric motion jacks. It's great if you can avoid pumping high pressure hydraulic fluid. You want to think about capacity to handle the mass you'll put on top. Also, number of degrees of freedom and dynamic response (can it give you twitchy movements, can it also give you large accelerations by massively tilting the platform). You have a layer that translates the desired accelerations from a physics model (say at 60 Hz) into filtered motion jack length commands (say 400 Hz or more). You don't need massive compute, just keep the latency down and ensure a steady stream of commands to the jacks. The experience you get from the simulator comes from multiple systems hitting your senses at the same time. You yank a joystick and expect to feel a motion cue and see something in the visual system. For flight sims used in pilot training, you need a response within 150 msec and you want the motion and visual to be in sync to avoid motion sickness. A car simulator would be a lot more twitchy than passenger aircraft, 150 msec may be too slow.