A question from the cheap seats...
A full motion sim consists of four main components. A sawed off cockpit section (with full working instrumentation) of an actual airplane, the hydraulic platform supporting the cockpit section to create the 3d sensation, the display unit to provide the visual sensation through the cockpit windows, and the processing unit to run the software powering the visuals and the motion. The only difference between aircraft models is the physical cockpit section and the software, which makes very little difference in the final cost. A 172 and 380 full motion sim will both be in the same price range.